Robust Crystal Phase Separation with Distinct Charge, Orbital, and Spin Orders in AgMn 7 O 12
An AA' B O -type A-site-ordered quadruple perovskite oxide AgMn O was prepared by high-pressure and high-temperature methods. At room temperature, the compound crystallizes into a cubic 3̅ symmetry with a charge distribution of AgMn Mn O . With the temperature decreasing to ≈ 180 K, the compoun...
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Published in | Inorganic chemistry Vol. 63; no. 6; pp. 3191 - 3198 |
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Main Authors | , , , , , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
United States
12.02.2024
|
Online Access | Get full text |
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Summary: | An AA'
B
O
-type A-site-ordered quadruple perovskite oxide AgMn
O
was prepared by high-pressure and high-temperature methods. At room temperature, the compound crystallizes into a cubic
3̅ symmetry with a charge distribution of AgMn
Mn
O
. With the temperature decreasing to
≈ 180 K, the compound undergoes a structural phase transition toward a monoclinic
2/
symmetry, giving rise to a B-site charge- and orbital-ordered AgMn
Mn
Mn
O
phase. Moreover, this charge-/orbital-ordered main phase coexists with the initial cubic AgMn
Mn
O
phase in the wide temperature range we measured. The charge-/orbital-ordered phase shows two antiferromagnetic phase transitions near 125 and 90 K, respectively. Short-range ferromagnetic correlations are found to occur for the initial B-site mixed cubic phase around 35 K. Because of the robust phase separation, considerable magnetoresistance effects are observed below
in AgMn
O
. |
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ISSN: | 0020-1669 1520-510X |
DOI: | 10.1021/acs.inorgchem.3c04360 |