Unusual Mott transition in multiferroic PbCrO3
The Mott insulator in correlated electron systems arises from classical Coulomb repulsion between carriers to provide a powerful force for electron localization. Turning such an insulator into a metal, the so-called Mott transition, is commonly achieved by "bandwidth" control or "band...
Saved in:
| Published in | Proceedings of the National Academy of Sciences - PNAS Vol. 112; no. 50; pp. 15320 - 15325 |
|---|---|
| Main Authors | , , , , , , , , , , , , , |
| Format | Journal Article |
| Language | English |
| Published |
United States
National Acad Sciences
15.12.2015
National Academy of Sciences |
| Subjects | |
| Online Access | Get full text |
Cover
Loading…
| Abstract | The Mott insulator in correlated electron systems arises from classical Coulomb repulsion between carriers to provide a powerful force for electron localization. Turning such an insulator into a metal, the so-called Mott transition, is commonly achieved by "bandwidth" control or "band filling." However, both mechanisms deviate from the original concept of Mott, which attributes such a transition to the screening of Coulomb potential and associated lattice contraction. Here, we report a pressure-induced isostructural Mott transition in cubic perovskite PbCrO3. At the transition pressure of ∼3 GPa, PbCrO3 exhibits significant collapse in both lattice volume and Coulomb potential. Concurrent with the collapse, it transforms from a hybrid multiferroic insulator to a metal. For the first time to our knowledge, these findings validate the scenario conceived by Mott. Close to the Mott criticality at ∼300 K, fluctuations of the lattice and charge give rise to elastic anomalies and Laudau critical behaviors resembling the classic liquid-gas transition. The anomalously large lattice volume and Coulomb potential in the low-pressure insulating phase are largely associated with the ferroelectric distortion, which is substantially suppressed at high pressures, leading to the first-order phase transition without symmetry breaking. |
|---|---|
| AbstractList | The Mott insulator in correlated electron systems arises from classical Coulomb repulsion between carriers to provide a powerful force for electron localization. Turning such an insulator into a metal, the so-called Mott transition, is commonly achieved by "bandwidth" control or "band filling." However, both mechanisms deviate from the original concept of Mott, which attributes such a transition to the screening of Coulomb potential and associated lattice contraction. Here, we report a pressure-induced isostructural Mott transition in cubic perovskite PbCrO3. At the transition pressure of ∼3 GPa, PbCrO3 exhibits significant collapse in both lattice volume and Coulomb potential. Concurrent with the collapse, it transforms from a hybrid multiferroic insulator to a metal. For the first time to our knowledge, these findings validate the scenario conceived by Mott. Close to the Mott criticality at ∼300 K, fluctuations of the lattice and charge give rise to elastic anomalies and Laudau critical behaviors resembling the classic liquid-gas transition. The anomalously large lattice volume and Coulomb potential in the low-pressure insulating phase are largely associated with the ferroelectric distortion, which is substantially suppressed at high pressures, leading to the first-order phase transition without symmetry breaking.The Mott insulator in correlated electron systems arises from classical Coulomb repulsion between carriers to provide a powerful force for electron localization. Turning such an insulator into a metal, the so-called Mott transition, is commonly achieved by "bandwidth" control or "band filling." However, both mechanisms deviate from the original concept of Mott, which attributes such a transition to the screening of Coulomb potential and associated lattice contraction. Here, we report a pressure-induced isostructural Mott transition in cubic perovskite PbCrO3. At the transition pressure of ∼3 GPa, PbCrO3 exhibits significant collapse in both lattice volume and Coulomb potential. Concurrent with the collapse, it transforms from a hybrid multiferroic insulator to a metal. For the first time to our knowledge, these findings validate the scenario conceived by Mott. Close to the Mott criticality at ∼300 K, fluctuations of the lattice and charge give rise to elastic anomalies and Laudau critical behaviors resembling the classic liquid-gas transition. The anomalously large lattice volume and Coulomb potential in the low-pressure insulating phase are largely associated with the ferroelectric distortion, which is substantially suppressed at high pressures, leading to the first-order phase transition without symmetry breaking. Understanding of the insulator–metal Mott transition in correlated systems has been one of the central themes in condensed-matter physics for more than half a century. The original Mott concept of a transition mechanism has been proposed in terms of the screening of Coulomb potential at high pressures, which, however, has not yet been experimentally validated. Such a scenario, for the first time to our knowledge, is unveiled in multiferroic PbCrO 3 with collapse of both the volume and Coulomb potential at high pressures, which is associated with atomic ferroelectric distortion. In addition, Mott critical behaviors, magnetic and ferroelectric properties, and the isostructural phase transition of this material are also explored. Findings in this work are fundamentally and technologically important for the study of correlated systems. The Mott insulator in correlated electron systems arises from classical Coulomb repulsion between carriers to provide a powerful force for electron localization. Turning such an insulator into a metal, the so-called Mott transition, is commonly achieved by “bandwidth” control or “band filling.” However, both mechanisms deviate from the original concept of Mott, which attributes such a transition to the screening of Coulomb potential and associated lattice contraction. Here, we report a pressure-induced isostructural Mott transition in cubic perovskite PbCrO 3 . At the transition pressure of ∼3 GPa, PbCrO 3 exhibits significant collapse in both lattice volume and Coulomb potential. Concurrent with the collapse, it transforms from a hybrid multiferroic insulator to a metal. For the first time to our knowledge, these findings validate the scenario conceived by Mott. Close to the Mott criticality at ∼300 K, fluctuations of the lattice and charge give rise to elastic anomalies and Laudau critical behaviors resembling the classic liquid–gas transition. The anomalously large lattice volume and Coulomb potential in the low-pressure insulating phase are largely associated with the ferroelectric distortion, which is substantially suppressed at high pressures, leading to the first-order phase transition without symmetry breaking. The Mott insulator in correlated electron systems arises from classical Coulomb repulsion between carriers to provide a powerful force for electron localization. Turning such an insulator into a metal, the so-called Mott transition, is commonly achieved by "bandwidth" control or "band filling." However, both mechanisms deviate from the original concept of Mott, which attributes such a transition to the screening of Coulomb potential and associated lattice contraction. Here, we report a pressure-induced isostructural Mott transition in cubic perovskite PbCrO3. At the transition pressure of ∼3 GPa, PbCrO3 exhibits significant collapse in both lattice volume and Coulomb potential. Concurrent with the collapse, it transforms from a hybrid multiferroic insulator to a metal. For the first time to our knowledge, these findings validate the scenario conceived by Mott. Close to the Mott criticality at ∼300 K, fluctuations of the lattice and charge give rise to elastic anomalies and Laudau critical behaviors resembling the classic liquid-gas transition. The anomalously large lattice volume and Coulomb potential in the low-pressure insulating phase are largely associated with the ferroelectric distortion, which is substantially suppressed at high pressures, leading to the first-order phase transition without symmetry breaking. |
| Author | Liang Yin Yusheng Zhao Yi Zhang Changqing Jin Xiaohui Yu Jiang Qian Jian Xu Jinlong Zhu Duanwei He Jianzhong Zhang Ligang Bai Neil S. Sullivan Shanmin Wang Wendan Wang |
| Author_xml | – sequence: 1 givenname: Shanmin surname: Wang fullname: Wang, Shanmin email: shanminwang@gmail.com, duanweihe@scu.edu.cn, Yusheng.Zhao@unlv.edu organization: Institute of Atomic & Molecular Physics, Sichuan University, Chengdu 610065, China; High Pressure Science & Engineering Center and Physics Department, University of Nevada, Las Vegas, NV 89154; Los Alamos Neutron Science Center and Materials Science & Technology Division, Los Alamos National Laboratory, Los Alamos, NM 87545; shanminwang@gmail.com duanweihe@scu.edu.cn Yusheng.Zhao@unlv.edu – sequence: 2 givenname: Jinlong surname: Zhu fullname: Zhu, Jinlong organization: High Pressure Science & Engineering Center and Physics Department, University of Nevada, Las Vegas, NV 89154; Los Alamos Neutron Science Center and Materials Science & Technology Division, Los Alamos National Laboratory, Los Alamos, NM 87545; National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China – sequence: 3 givenname: Yi surname: Zhang fullname: Zhang, Yi organization: High Pressure Science & Engineering Center and Physics Department, University of Nevada, Las Vegas, NV 89154 – sequence: 4 givenname: Xiaohui surname: Yu fullname: Yu, Xiaohui organization: Los Alamos Neutron Science Center and Materials Science & Technology Division, Los Alamos National Laboratory, Los Alamos, NM 87545; National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China – sequence: 5 givenname: Jianzhong surname: Zhang fullname: Zhang, Jianzhong organization: Los Alamos Neutron Science Center and Materials Science & Technology Division, Los Alamos National Laboratory, Los Alamos, NM 87545 – sequence: 6 givenname: Wendan surname: Wang fullname: Wang, Wendan organization: Institute of Atomic & Molecular Physics, Sichuan University, Chengdu 610065, China – sequence: 7 givenname: Ligang surname: Bai fullname: Bai, Ligang organization: High Pressure Science & Engineering Center and Physics Department, University of Nevada, Las Vegas, NV 89154; High Pressure Collaborative Access Team, Geophysical Laboratory, Carnegie Institution of Washington, Argonne, IL 60439 – sequence: 8 givenname: Jiang surname: Qian fullname: Qian, Jiang organization: US Synthetic Corporation, Orem, UT 84058 – sequence: 9 givenname: Liang surname: Yin fullname: Yin, Liang organization: Department of Physics, University of Florida, Gainesville, FL 32611 – sequence: 10 givenname: Neil S surname: Sullivan fullname: Sullivan, Neil S organization: Department of Physics, University of Florida, Gainesville, FL 32611 – sequence: 11 givenname: Changqing surname: Jin fullname: Jin, Changqing organization: National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; Collaborative Innovation Center of Quantum Matter, Beijing 100871, China – sequence: 12 givenname: Duanwei surname: He fullname: He, Duanwei email: shanminwang@gmail.com, duanweihe@scu.edu.cn, Yusheng.Zhao@unlv.edu organization: Institute of Atomic & Molecular Physics, Sichuan University, Chengdu 610065, China; shanminwang@gmail.com duanweihe@scu.edu.cn Yusheng.Zhao@unlv.edu – sequence: 13 givenname: Jian surname: Xu fullname: Xu, Jian organization: Institute of Atomic & Molecular Physics, Sichuan University, Chengdu 610065, China – sequence: 14 givenname: Yusheng surname: Zhao fullname: Zhao, Yusheng email: shanminwang@gmail.com, duanweihe@scu.edu.cn, Yusheng.Zhao@unlv.edu organization: High Pressure Science & Engineering Center and Physics Department, University of Nevada, Las Vegas, NV 89154; Los Alamos Neutron Science Center and Materials Science & Technology Division, Los Alamos National Laboratory, Los Alamos, NM 87545; shanminwang@gmail.com duanweihe@scu.edu.cn Yusheng.Zhao@unlv.edu |
| BackLink | https://www.ncbi.nlm.nih.gov/pubmed/26604314$$D View this record in MEDLINE/PubMed |
| BookMark | eNpVUE1LxDAUDKK4H3r2Jj166fpe89HmIsjiF6ysB_cc0jbVLG2yNq3gvzfguug7vMdjhplhZuTYeWcIuUBYIOT0eud0WCBHYHFhdkSmCBJTwSQckylAlqcFy9iEzELYAoDkBZySSSYEMIpsShYbN4ZRt8mzH4Zk6LULdrDeJdYl3dgOtjF9722VvJTLfk3PyEmj22DO93dONvd3r8vHdLV-eFrertIt5fmQ6lrrRhpexhxQ1KIpacU0gEHJStZILLjACqngtAImivjUlamgyOuCG4N0Tm5-dHdj2ZmIuRitVbvedrr_Ul5b9R9x9l29-U8VxXLOIApc7QV6_zGaMKjOhsq0rXbGj0FhzmQcEDJSL_96HUx-S4qEZE-IbR_gWLfioJDTDOg3k1B1xw |
| ContentType | Journal Article |
| DBID | NPM 7X8 5PM |
| DOI | 10.1073/pnas.1510415112 |
| DatabaseName | PubMed MEDLINE - Academic PubMed Central (Full Participant titles) |
| DatabaseTitle | PubMed MEDLINE - Academic |
| DatabaseTitleList | MEDLINE - Academic PubMed |
| Database_xml | – sequence: 1 dbid: NPM name: PubMed url: https://proxy.k.utb.cz/login?url=http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed sourceTypes: Index Database |
| DeliveryMethod | fulltext_linktorsrc |
| Discipline | Sciences (General) |
| DocumentTitleAlternate | Unusual Mott transition in multiferroic PbCrO3 |
| EISSN | 1091-6490 |
| EndPage | 15325 |
| ExternalDocumentID | PMC4687540 26604314 112_50_15320 |
| Genre | Research Support, U.S. Gov't, Non-P.H.S Research Support, Non-U.S. Gov't Journal Article |
| GroupedDBID | - 02 0R 123 1AW 29P 2WC 53G 55 5RE 5VS 85S AAPBV ABBHK ABFLS ABOCM ABPPZ ABPTK ABZEH ACGOD ACIWK ACNCT ACPRK ADACO ADULT ADZLD AENEX AFFNX AFRAH ALMA_UNASSIGNED_HOLDINGS ASUFR BKOMP CS3 D0L DCCCD DIK DNJUQ DOOOF DU5 DWIUU DZ E3Z EBS EJD F20 F5P FRP GX1 H13 HH5 HYE JLS JPM JSG JSODD JST KM KQ8 L7B LU7 N9A N~3 O9- OK1 PNE PQEST PQQKQ R.V RHF RHI RNA RNS RPM RXW SA0 SJN TAE TN5 UKR VQA WH7 WOQ WOW X X7M XHC Y6R ZA5 --- -DZ -~X .55 0R~ 2AX 2FS 4.4 AACGO AAFWJ AANCE ABPLY ABTLG ABXSQ ACHIC ADQXQ AEUPB AEXZC AFOSN AQVQM IPSME JAAYA JBMMH JENOY JHFFW JKQEH JLXEF NPM W8F XSW YBH YKV YSK ZCA ~02 ~KM 7X8 5PM |
| ID | FETCH-LOGICAL-j357t-adaaf9e5b49008d6fb3c4a00e194b4f918561c13653c046861cdcec087d85ee13 |
| ISSN | 0027-8424 1091-6490 |
| IngestDate | Thu Aug 21 18:45:50 EDT 2025 Sun Aug 24 03:38:51 EDT 2025 Thu Apr 03 06:56:23 EDT 2025 Wed Nov 11 00:29:29 EST 2020 |
| IsDoiOpenAccess | false |
| IsOpenAccess | true |
| IsPeerReviewed | true |
| IsScholarly | true |
| Issue | 50 |
| Keywords | Mott transition multiferroics Mott criticality PbCrO3 isostructural transition |
| Language | English |
| LinkModel | OpenURL |
| MergedId | FETCHMERGED-LOGICAL-j357t-adaaf9e5b49008d6fb3c4a00e194b4f918561c13653c046861cdcec087d85ee13 |
| Notes | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 Edited by Ho-kwang Mao, Carnegie Institution of Washington, Washington, DC, and approved November 3, 2015 (received for review May 28, 2015) 1S.W. and J. Zhu contributed equally to this work. Author contributions: S.W., D.H., and Y. Zhao designed research; S.W., J. Zhu, Y. Zhang, X.Y., W.W., L.B., J.Q., L.Y., N.S.S., C.J., and D.H. performed research; S.W., J. Zhu, Y. Zhang, J. Zhang, J.X., and Y. Zhao analyzed data; and S.W. and J. Zhang wrote the paper. 3Present address: Chemical & Engineering Materials Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831. |
| PMID | 26604314 |
| PQID | 1749999069 |
| PQPubID | 23479 |
| PageCount | 6 |
| ParticipantIDs | pubmedcentral_primary_oai_pubmedcentral_nih_gov_4687540 pubmed_primary_26604314 pnas_primary_112_50_15320 proquest_miscellaneous_1749999069 |
| ProviderPackageCode | RNA PNE |
| PublicationCentury | 2000 |
| PublicationDate | 2015-12-15 |
| PublicationDateYYYYMMDD | 2015-12-15 |
| PublicationDate_xml | – month: 12 year: 2015 text: 2015-12-15 day: 15 |
| PublicationDecade | 2010 |
| PublicationPlace | United States |
| PublicationPlace_xml | – name: United States |
| PublicationTitle | Proceedings of the National Academy of Sciences - PNAS |
| PublicationTitleAlternate | Proc Natl Acad Sci U S A |
| PublicationYear | 2015 |
| Publisher | National Acad Sciences National Academy of Sciences |
| Publisher_xml | – name: National Acad Sciences – name: National Academy of Sciences |
| References | 16803146 - Phys Rev Lett. 2006 May 19;96(19):198501 19422196 - Inorg Chem. 2009 Jun 15;48(12):5434-8 10990897 - Phys Rev Lett. 2000 May 29;84(22):5180-3 17199121 - Nat Mater. 2007 Jan;6(1):13-20 14526075 - Science. 2003 Oct 3;302(5642):89-92 20660782 - Proc Natl Acad Sci U S A. 2010 Aug 10;107(32):14026-9 9992767 - Phys Rev B Condens Matter. 1990 Jan 1;41(1):288-299 12906561 - Phys Rev Lett. 2003 Jul 4;91(1):016401 14611355 - Phys Rev Lett. 2003 Oct 24;91(17):175501 23002762 - Phys Rev Lett. 2012 Aug 24;109(8):086402 9005849 - Science. 1997 Jan 31;275(5300):654-7 18246073 - Nat Mater. 2008 Mar;7(3):198-202 17678316 - Phys Rev Lett. 2007 Jul 20;99(3):037003 22020006 - Nat Mater. 2011 Oct 24;10(11):823-37 17199122 - Nat Mater. 2007 Jan;6(1):21-9 23215206 - Phys Rev Lett. 2012 Oct 26;109(17):176401 26374486 - J Am Chem Soc. 2015 Oct 7;137(39):12719-28 25624483 - Proc Natl Acad Sci U S A. 2015 Feb 10;112(6):1670-4 9983572 - Phys Rev B Condens Matter. 1996 Jan 15;53(3):1161-1170 |
| References_xml | – reference: 9992767 - Phys Rev B Condens Matter. 1990 Jan 1;41(1):288-299 – reference: 17199122 - Nat Mater. 2007 Jan;6(1):21-9 – reference: 25624483 - Proc Natl Acad Sci U S A. 2015 Feb 10;112(6):1670-4 – reference: 17199121 - Nat Mater. 2007 Jan;6(1):13-20 – reference: 18246073 - Nat Mater. 2008 Mar;7(3):198-202 – reference: 9983572 - Phys Rev B Condens Matter. 1996 Jan 15;53(3):1161-1170 – reference: 22020006 - Nat Mater. 2011 Oct 24;10(11):823-37 – reference: 23002762 - Phys Rev Lett. 2012 Aug 24;109(8):086402 – reference: 26374486 - J Am Chem Soc. 2015 Oct 7;137(39):12719-28 – reference: 9005849 - Science. 1997 Jan 31;275(5300):654-7 – reference: 14611355 - Phys Rev Lett. 2003 Oct 24;91(17):175501 – reference: 16803146 - Phys Rev Lett. 2006 May 19;96(19):198501 – reference: 14526075 - Science. 2003 Oct 3;302(5642):89-92 – reference: 10990897 - Phys Rev Lett. 2000 May 29;84(22):5180-3 – reference: 17678316 - Phys Rev Lett. 2007 Jul 20;99(3):037003 – reference: 19422196 - Inorg Chem. 2009 Jun 15;48(12):5434-8 – reference: 23215206 - Phys Rev Lett. 2012 Oct 26;109(17):176401 – reference: 20660782 - Proc Natl Acad Sci U S A. 2010 Aug 10;107(32):14026-9 – reference: 12906561 - Phys Rev Lett. 2003 Jul 4;91(1):016401 |
| SSID | ssj0009580 |
| Score | 2.3084304 |
| Snippet | The Mott insulator in correlated electron systems arises from classical Coulomb repulsion between carriers to provide a powerful force for electron... Understanding of the insulator–metal Mott transition in correlated systems has been one of the central themes in condensed-matter physics for more than half a... |
| SourceID | pubmedcentral proquest pubmed pnas |
| SourceType | Open Access Repository Aggregation Database Index Database Publisher |
| StartPage | 15320 |
| SubjectTerms | Physical Sciences |
| Title | Unusual Mott transition in multiferroic PbCrO3 |
| URI | http://www.pnas.org/content/112/50/15320.abstract https://www.ncbi.nlm.nih.gov/pubmed/26604314 https://www.proquest.com/docview/1749999069 https://pubmed.ncbi.nlm.nih.gov/PMC4687540 |
| Volume | 112 |
| hasFullText | 1 |
| inHoldings | 1 |
| isFullTextHit | |
| isPrint | |
| link | http://utb.summon.serialssolutions.com/2.0.0/link/0/eLvHCXMwnV1Lb5tAEF656aWXqumTvkSlHlpFuMAur2NkNbIi2fUhVt1erAUWmahZIgOX_o_-386wC2wiH5JckHkY8My381jPfEvIZyYg7C5y4aD_cJjPUyeJee6wKEuDhGdFIjBRXCzD-Zqdb4LNZPLPqFpqm3Sa_T3YV_IQrcIx0Ct2yd5Ds8NN4QB8Bv3CFjQM2zvpeC3bGts_Fsiv0KDXKfvaxa5QsBD7fYW17-ls_4Oacehq8Ft1XyWw7KcFT8cmEz3y6xPnZLUclyz-2U8y77i8Kgd4_d61HShK-afSDtGckv5VDiamu25T8mrXlua8gxdgDYfqvDRpuw--lGlwfXCCTLVJT4WysRCiOCFTq4QORtjzDbQpLlptUz1cu8Jw0LgfHLT-YK5wyWLJ6ykEMkg-oG9rYOH6qgMDxCVIK8RGNzgUJ64WMxZCGsfcR-SxD9lHVy86N7mcY9XZpH9bzxgV0W-3no1U0_pBSJ4LJw8lMrfrcY0A5-IZeaozE_tUweyYTIR8To57YdtfNEH51xdkqnFnI-7sEXd2KW0Td7bC3UuyPvt-MZs7et0N55IGUePwnHMYo0EKOnLjPCxSmjHuusJLWMqKBEK80MuwPpJmLogKduDVMzeO8jgQwqOvyJGspHhDbErTkMcRjPnCY0UgeOTmNE8K3-Pg2eLCIhZKZXutqFUgH_W3AaSlqHKLfOpFtQWbh39kcSmqtt5CFg15TeKGiUVeK9ENd-jlbZHohlCHC5BP_eYZWe46XnWt9bcP_uY78mQcKe_JUbNvxQeIWZv0Y4eg_5Iglro |
| linkProvider | ABC ChemistRy |
| openUrl | ctx_ver=Z39.88-2004&ctx_enc=info%3Aofi%2Fenc%3AUTF-8&rfr_id=info%3Asid%2Fsummon.serialssolutions.com&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.atitle=Unusual+Mott+transition+in+multiferroic+PbCrO3&rft.jtitle=Proceedings+of+the+National+Academy+of+Sciences+-+PNAS&rft.au=Wang%2C+Shanmin&rft.au=Zhu%2C+Jinlong&rft.au=Zhang%2C+Yi&rft.au=Yu%2C+Xiaohui&rft.date=2015-12-15&rft.pub=National+Academy+of+Sciences&rft.issn=0027-8424&rft.eissn=1091-6490&rft.volume=112&rft.issue=50&rft.spage=15320&rft.epage=15325&rft_id=info:doi/10.1073%2Fpnas.1510415112&rft_id=info%3Apmid%2F26604314&rft.externalDocID=PMC4687540 |
| thumbnail_m | http://utb.summon.serialssolutions.com/2.0.0/image/custom?url=http%3A%2F%2Fwww.pnas.org%2Fcontent%2F112%2F50.cover.gif |
| thumbnail_s | http://utb.summon.serialssolutions.com/2.0.0/image/custom?url=http%3A%2F%2Fwww.pnas.org%2Fcontent%2F112%2F50.cover.gif |