Magnetic transition in orbitally ordered KCuF3, K2CuF4 and heterovalently substituted compounds

被引：7

作者：

Mazzoli, C

Allodi, G ^{[1
]}

Guidi, G

De Renzi, R

Ghigna, P

Baines, C

机构：

[1] INFM, Dipartimento Fis, I-43100 Parma, Italy

[2] INFM, Unita Parma, I-43100 Parma, Italy

[3] Ist Nazl Fis Nucl, Dipartimento Chim Fis, I-27100 Pavia, Italy

[4] Ist Nazl Fis Nucl, Unita Pavia, I-27100 Pavia, Italy

[5] Paul Scherrer Inst, CH-5232 Villigen, Switzerland

来源：

PHYSICA B-CONDENSED MATTER | 2003年 / 326卷 / 1-4期

关键词：

fluorides; perovskites; Jahn-Teller distortion;

D O I：

10.1016/S0921-4526(02)01656-3

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We report muSR data from pseudo-cubic and layered copper fluorides, KCuF3, K2CuF4, and its substitutions K1.9Sr0.1CuF4, K2CuF3.9O0.1, K2C1.8Zn0.2F4. In KCuF3, the extinction of the F-Mu-F fraction and its progressive replacement by a magnetic fraction between 40 and 35 K demonstrate a first-order magnetic transition at T-N, probably driven by orbital degrees of freedom. The layered compounds exhibit on the contrary conventional second-order transitions at T-c = 6.25 K, independent of electron or hole doping up to at least x = 0.1. However, 20% substitution of Cu with non-magnetic Zn completely suppresses long-range magnetic order above 1.3 K. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：427 / 430

页数：4