Jahn-Teller distortion ordering in single-crystal Nd1/2Sr1/2MnO3
Charge, spin and orbital degrees of freedom play important roles in the electrical and magnetic properties of manganites. Nd0.5Sr0.5MnO3 is a paramagnetic insulator with Imma orthorhombic symmetry at room temperature. Upon cooling it becomes a ferromagnetic metal below 240 K and at 160 K undergoes a...
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Published in | Physica status solidi. C Vol. 1; no. 7; pp. 1641 - 1644 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
Berlin
WILEY-VCH Verlag
01.05.2004
WILEY‐VCH Verlag |
Subjects | |
Online Access | Get full text |
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Summary: | Charge, spin and orbital degrees of freedom play important roles in the electrical and magnetic properties of manganites. Nd0.5Sr0.5MnO3 is a paramagnetic insulator with Imma orthorhombic symmetry at room temperature. Upon cooling it becomes a ferromagnetic metal below 240 K and at 160 K undergoes a first‐order phase transition. Below this temperature it is a CE‐type antiferromagnetic insulator. In this paper we report synchrotron X‐ray scattering investigations of superlattice reflections observed in the low temperature phase of Nd0.5Sr0.5MnO3. Upon cooling below 160 K we observed additional peaks occurring at non‐integer positions in reciprocal space. These reflections had a wavevector (1/2, 0, 0) and are due to the structural modulation arising from the Jahn‐Teller distortion associated with charge ordering of Mn3+ and Mn4+ ions and orbital ordering in the sample. The peaks observed below 160 K have an intensity of approximately 10−3 that of the Bragg reflections. The intensity profiles of these reflections show that the transition into the ordered phase is strongly first‐order. The structural phase transition was observed to display a hysteresis width of 10 K. The measured widths of these peaks show that the charge modulation is correlated primarily in the ac plane rather than the K‐direction (long‐axis). (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) |
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Bibliography: | ark:/67375/WNG-NDWXWX56-3 istex:01125B437BC89A0A3C374B7E4855C9C14EFFD446 ArticleID:PSSC200304405 SourceType-Scholarly Journals-2 ObjectType-Feature-2 ObjectType-Conference Paper-1 content type line 23 SourceType-Conference Papers & Proceedings-1 ObjectType-Article-3 |
ISSN: | 1610-1634 1610-1642 |
DOI: | 10.1002/pssc.200304405 |