High-Pressure Synthesis of a B-site Co2+/Mn4+ Disordered Quadruple Perovskite LaMn3Co2Mn2O12

被引：9

作者：

Guo, Jia ^{[1
,2
]}

Shen, Xudong ^{[1
,3
]}

Liu, Zhehong ^{[1
,2
]}

Qin, Shijun ^{[1
,2
]}

Wang, Weipeng ^{[1
,2
]}

Ye, Xubin ^{[1
,2
]}

Liu, Guangxiu ^{[1
,2
]}

Yu, Richeng ^{[1
,2
]}

Lin, Hong-Ji ^{[4
]}

Chen, Chien-Te ^{[4
]}

Tjeng, Liu-Hao ^{[5
]}

Hu, Zhiwei ^{[5
]}

Long, Youwen ^{[1
,2
,3
]}

机构：

[1] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China

[2] Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100049, Peoples R China

[3] Songshan Lake Mat Lab, Dongguan 523808, Guangdong, Peoples R China

[4] Natl Synchrotron Radiat Res Ctr, Hsinchu 30076, Taiwan

[5] Max Planck Inst Chem Phys Solids, D-01187 Dresden, Germany

来源：

INORGANIC CHEMISTRY | 2020年 / 59卷 / 17期

基金：

中国国家自然科学基金; 国家重点研发计划;

关键词：

COLOSSAL MAGNETORESISTANCE; ROOM-TEMPERATURE; CHARGE-TRANSFER; MAGNETISM;

D O I：

10.1021/acs.inorgchem.0c01548

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

A new oxide, LaMn3Co2Mn2O12, was synthesized under high-pressure (7 GPa) and high-temperature (1423 K) conditions. The compound crystallizes in an AA'3B4O12-type quadruple perovskite structure with space group Im (3) over bar. The Rietveld structural analysis combined with soft X-ray absorption spectroscopy reveals the charge combination to be LaMn33+Co22+Mn24+O12, where the La3+ and Mn3+ are 1:3 ordered respectively at the A and A' sites, whereas the Co2+ and Mn4+ are disorderly distributed at the B site. This is in sharp contrast to R2Co2+Mn4+O6 (R = La and rare earth) double perovskites, in which the Co2+ and Mn4+ charge states are always orderly distributed with a rocksalt-type fashion, giving rise to a long-range magnetic ordering. As a result, LaMn3Co2Mn2O12 displays spin glassy magnetic properties due to the random Co2+ and Mn4+ distribution, as demonstrated by dc and ac magnetic susceptibility as well as specific heat measurements. Possible factors that affect the B-site degree of order in perovskite structures are discussed.

引用

页码：12445 / 12452

页数：8

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