標題: Competition between the charge ordered and ferromagnetic states in (La,Nd)(0.75)Na0.25MnO3 manganites
作者: Li, ZQ
Zhang, XH
Yu, JS
Liu, XJ
Liu, XD
Liu, H
Wu, P
Bai, HL
Sun, CQ
Lin, JJ
Jiang, EY
物理研究所
Institute of Physics
關鍵字: manganites;colossal magnetoresistance;charge-ordering;phase separation
公開日期: 24-May-2004
摘要: Structural, magnetic, and transport properties of (La1-xNdx)(0.75)Na0.25MnO3 (0 less than or equal to x less than or equal to 1) are studied. The system exhibits a rhombohedrally distorted perovskite structure for x less than or equal to 0.2 and it convert to an orthorhombic structure for x greater than or equal to 0.4. Re-entrant ferromagnetic type charge ordering transitions are observed in the narrow bandwidth samples (x greater than or equal to 0.6), while charge ordering transition is not observed for these samples with rhombohedral structure. Combining with the published results related to the charge ordering transition, we argue that the rhombohedral structure likely favor double exchange interaction and suppress charge ordering interaction. The compounds show metal to insulator transitions except Nd0.75Na0.25MnO3. The resistivity data above the metal to insulator transition temperature for the charge ordered sample are discussed in the frame work of variable-range hopping model. (C) 2004 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.physleta.2004.04.003
http://hdl.handle.net/11536/26761
ISSN: 0375-9601
DOI: 10.1016/j.physleta.2004.04.003
期刊: PHYSICS LETTERS A
Volume: 325
Issue: 5-6
起始頁: 430
結束頁: 434
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