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

• 来源期刊: 中国物理(英文版)
• 学科: 物理学
• 关键词: structure magnetic property
• 年，卷（期）: 2001,（9）
• 所属期刊栏目: CONDENSED MATTER:STRUCTURE,THERMAL AND MECHANICAL
• 页码范围: 857-861
• 页数: 5页
• 分类号: O4
• 语种: 英文

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.