CRYSTAL STRUCTURE AND MAGNETIC PROPERTIES OF La1.2Sr1.8-xCaxMn2O7

doi:10.1088/1009-1963/10/9/316

中国物理B ›› 2001, Vol. 10 ›› Issue (9): 853-856.doi: 10.1088/1009-1963/10/9/316

CRYSTAL STRUCTURE AND MAGNETIC PROPERTIES OF La_1.2Sr_1.8-xCa_xMn₂O₇

何伦华, 张泮霖, 严启伟

State Key Laboratory of Magnetism, Institute of Physics and Centre for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China

收稿日期:2001-04-23 修回日期:2001-05-09 出版日期:2001-09-15 发布日期:2005-06-12

CRYSTAL STRUCTURE AND MAGNETIC PROPERTIES OF La_1.2Sr_1.8-xCa_xMn₂O₇

He Lun-hua (何伦华), Zhang Pan-lin (张泮霖), Yan Qi-wei (严启伟)

State Key Laboratory of Magnetism, Institute of Physics and Centre for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China

Received:2001-04-23 Revised:2001-05-09 Online:2001-09-15 Published:2005-06-12

摘要/Abstract

摘要： The effect of divalent cation substitution on the structure and magnetic properties of La_1.2Sr_1.8-xCa_xMn₂O₇ (x = 0－0.900) is investigated in this paper. Partly replacing divalent cation Sr²⁺ by Ca²⁺ ions results in the weakening and then disappearance of long-range ferromagnetic ordering, and the formation of spin canting and low-temperature spin-glass. Based on structural analysis by Rietveld profile fitting, we suggest that this variation of magnetic property be related to a Jahn－Teller-type attice distortion of MnO₆ octahedra due to the introduction of the smaller sized Ca²⁺ ions.

Abstract: The effect of divalent cation substitution on the structure and magnetic properties of La_1.2Sr_1.8-xCa_xMn₂O₇ (x = 0－0.900) is investigated in this paper. Partly replacing divalent cation Sr²⁺ by Ca²⁺ ions results in the weakening and then disappearance of long-range ferromagnetic ordering, and the formation of spin canting and low-temperature spin-glass. Based on structural analysis by Rietveld profile fitting, we suggest that this variation of magnetic property be related to a Jahn－Teller-type attice distortion of MnO₆ octahedra due to the introduction of the smaller sized Ca²⁺ ions.

Key words: structure, magnetic property, Jahn－Teller distortion

中图分类号: (Inorganic compounds)

61.66.Fn

75.30.Et (Exchange and superexchange interactions) 75.50.Cc (Other ferromagnetic metals and alloys)

何伦华, 张泮霖, 严启伟. CRYSTAL STRUCTURE AND MAGNETIC PROPERTIES OF La_1.2Sr_1.8-xCa_xMn₂O₇[J]. 中国物理B, 2001, 10(9): 853-856.

He Lun-hua (何伦华), Zhang Pan-lin (张泮霖), Yan Qi-wei (严启伟). CRYSTAL STRUCTURE AND MAGNETIC PROPERTIES OF La_1.2Sr_1.8-xCa_xMn₂O₇[J]. Chinese Physics, 2001, 10(9): 853-856.

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CRYSTAL STRUCTURE AND MAGNETIC PROPERTIES OF La_1.2Sr_1.8-xCa_xMn₂O₇

CRYSTAL STRUCTURE AND MAGNETIC PROPERTIES OF La_1.2Sr_1.8-xCa_xMn₂O₇

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