First-order transition and phase separation in pyrochlores with colossal magnetoresistance -: art. no. 104412

被引：0

作者：

Velasco, P ^{[1
]}

Mira, J

Guinea, F

Rivas, J

Martínez-Lope, MJ

Alonso, JA

Martínez, JL

机构：

[1] CSIC, Inst Ciencia Mat Madrid, E-28049 Madrid, Spain

[2] Univ Santiago de Compostela, Dept Fis Aplicada, E-15782 Santiago De Compostela, Spain

来源：

PHYSICAL REVIEW B | 2002年 / 66卷 / 10期

关键词：

D O I：

暂无

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Tl2Mn2O7 pyrochlores present colossal magnetoresistance (CMR) around the long-range ferromagnetic ordering temperature (T-C). The character of this magnetic phase transition has been determined to be first order, by purely magnetic methods, in contrast to the second order character previously reported by Zhao [Phys. Rev. Lett. 83, 219 (1999)]. The highest CMR effect, as in Tl1.8Cd0.2Mn2O7, corresponds to a stronger first order character. This character implies a second type of magnetic interaction, in addition to the direct superexchange between the Mn4+ ions, as well as a phase coexistence. A model is proposed, with a complete Hamiltonian (including superexchange and an indirect interaction), which reproduce the observed phenomenology.

引用

页数：4

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