THE STRUCTURE AND MAGNETIC PROPERTIES OF La2-2xSr1Ca2xMn2O7 (x=0.25－1.00)

doi:10.1088/1009-1963/10/9/317

中国物理B ›› 2001, Vol. 10 ›› Issue (9): 857-861.doi: 10.1088/1009-1963/10/9/317

THE STRUCTURE AND MAGNETIC PROPERTIES OF La_2-2xSr₁Ca_2xMn₂O₇ (x=0.25－1.00)

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:2001-04-29 修回日期:2001-05-16 出版日期:2001-09-15 发布日期:2005-06-12

THE STRUCTURE AND MAGNETIC PROPERTIES OF La_2-2xSr₁Ca_2xMn₂O₇ (x=0.25－1.00)

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:2001-04-29 Revised:2001-05-16 Online:2001-09-15 Published:2005-06-12

摘要/Abstract

摘要： In this paper, the effect of divalent cation substitution on the structure and magnetic properties in La_2-2xSr₁Ca_2xMn₂O₇ have been investigated systematically using bulk samples with a wide doping concentration range 0.25≤x≤1.00. Replacing trivalent La ions by divalent Ca ions results in the weakening and then disappearance of the long-range ferromagnetic (FM) ordering, the formation of spin canting, antiferromagnetic (AFM) ordering and low-temperature spin-glass. These results show that increasing the hole-doping concentration significantly suppresses the FM state. We suggest that this variation of magnetic properties is related to the competition of the FM and AFM interactions resulting from the change of Mn³⁺/Mn⁴⁺ ratio and Jahn-Teller-type lattice distortion of MnO₆ octahedra due to the introduction of Ca²⁺ ions.

Abstract: In this paper, the effect of divalent cation substitution on the structure and magnetic properties in La_2-2xSr₁Ca_2xMn₂O₇ have been investigated systematically using bulk samples with a wide doping concentration range 0.25≤x≤1.00. Replacing trivalent La ions by divalent Ca ions results in the weakening and then disappearance of the long-range ferromagnetic (FM) ordering, the formation of spin canting, antiferromagnetic (AFM) ordering and low-temperature spin-glass. These results show that increasing the hole-doping concentration significantly suppresses the FM state. We suggest that this variation of magnetic properties is related to the competition of the FM and AFM interactions resulting from the change of Mn³⁺/Mn⁴⁺ ratio and Jahn-Teller-type lattice distortion of MnO₆ octahedra due to the introduction of Ca²⁺ ions.

Key words: structure, magnetic property

中图分类号: (Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.))

75.40.Cx

75.40.Gb (Dynamic properties?) 75.30.-m (Intrinsic properties of magnetically ordered materials) 75.50.Dd (Nonmetallic ferromagnetic materials) 75.50.Ee (Antiferromagnetics) 75.50.Lk (Spin glasses and other random magnets)

何伦华, 张泮霖, 严启伟. THE STRUCTURE AND MAGNETIC PROPERTIES OF La_2-2xSr₁Ca_2xMn₂O₇ (x=0.25－1.00)[J]. 中国物理B, 2001, 10(9): 857-861.

He Lun-hua (何伦华), Zhang Pan-lin (张泮霖), Yan Qi-wei (严启伟). THE STRUCTURE AND MAGNETIC PROPERTIES OF La_2-2xSr₁Ca_2xMn₂O₇ (x=0.25－1.00)[J]. Chinese Physics, 2001, 10(9): 857-861.

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THE STRUCTURE AND MAGNETIC PROPERTIES OF La_2-2xSr₁Ca_2xMn₂O₇ (x=0.25－1.00)

THE STRUCTURE AND MAGNETIC PROPERTIES OF La_2-2xSr₁Ca_2xMn₂O₇ (x=0.25－1.00)

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