Thermal, magnetic and structural aspects of transitions in Mn0.63Cr0.37As. Thermodynamic properties from 10 to 350 K
作者:N. Komada、E.F. Westrum、H. Fjellvåg、A. Kjekshus
DOI:10.1016/0304-8853(87)90308-8
日期:1987.2
-type) and structural (MnP- to MnP-type) transition, accompanied by a discontinuous unit cell volume change, and a second order magnetic [heli-(H c ) to paramagnetic] transition are observed at 165 and 219 K, respectively. The thermodynamic functions are derived and the thermodynamic characteristics of the transitions are discussed. The enthalpy and entropy of the combined MnP,H a - to MnP,H c - and
摘要 Mn 0.63 Cr 0.37 As 上的低温晶体和磁结构以及热容量在 350 K 以下测量。复杂的一级磁(螺旋 H a - 到 H c - 型)和结构(MnP - 到 MnP 型)转变,伴随通过不连续的晶胞体积变化,分别在 165 和 219 K 处观察到二阶磁性 [heli-(H c ) 到顺磁性] 转变。导出了热力学函数并讨论了转变的热力学特性。MnP,H a - 到 MnP,H c - 和 MnP,H c ⇌ MnP,P 型跃迁的焓和熵分别估计为 124.8 RK 和 0.749 R。用于将磁热容包络解卷积为从 MnP,H a - 到 MnP,H c - 和 MnP,H c ⇌ MnP 的贡献的两种不同模型,