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

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

何伦华, 张泮霖, 严启伟   

  1. 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 La2-2xSr1Ca2xMn2O7 (x=0.25－1.00)

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

  1. 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

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摘要： In this paper, the effect of divalent cation substitution on the structure and magnetic properties in La2-2xSr1Ca2xMn2O7 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 La2-2xSr1Ca2xMn2O7 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)