Multiple phase transitions in CuO observed with thermal expansion

被引：13

作者：

Rebello, A. ^{[1
]}

Winter, Z. C. M. ^{[1
]}

Viall, S. ^{[1
]}

Neumeier, J. J. ^{[1
]}

机构：

[1] Montana State Univ, Dept Phys, Bozeman, MT 59717 USA

来源：

PHYSICAL REVIEW B | 2013年 / 88卷 / 09期

基金：

美国国家科学基金会;

关键词：

CUPRIC OXIDE; CHARGE STRIPES; HEAT; POLARIZATION; MAGNETISM; ORDER; XY;

D O I：

10.1103/PhysRevB.88.094420

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

High-resolution thermal-expansion measurements of single-crystalline CuO (tenorite) are reported for the temperature range 5 < T < 350 K. The data reveal three transitions (T-N1 = 213 K, T-N2 = 229.2 K, and T-N3 = 229.8 K), which corroborate the recently proposed magnetic phase diagram [Villarreal, Quirion, Plumer, Poirier, Usui, and Kimura, Phys. Rev. Lett. 109, 167206 (2012)] revealing three distinct antiferromagnetic (AFM) phases. Analysis of the region surrounding T-N2 and T-N3 suggests that these phase transitions are continuous and yields estimates for the heat-capacity critical exponents of alpha(TN2) = 0.033(2) and alpha(TN3) = 0.040(9). Magnetic susceptibility measurements reveal spin-flop transitions at temperatures below T-N1, confirming that the b axis is the easy AFM axis.

引用

页数：6

共 42 条

[1] MAGNETIC-STRUCTURE OF CUO BY NEUTRON-DIFFRACTION WITH POLARIZATION ANALYSIS [J].