Schottky-like anomaly in the low-temperature specific heat of single-crystal NdMnO3

被引：19

作者：

Cheng, JG ^{[1
]}

Sui, Y ^{[1
]}

Qian, ZN ^{[1
]}

Liu, ZG ^{[1
]}

Miao, JP ^{[1
]}

Huang, XQ ^{[1
]}

Lu, Z ^{[1
]}

Li, Y ^{[1
]}

Wang, XJ ^{[1
]}

Su, WH ^{[1
]}

机构：

[1] Harbin Inst Technol, CCMST, Dept Appl Phys, Harbin 150001, Peoples R China

来源：

SOLID STATE COMMUNICATIONS | 2005年 / 134卷 / 06期

基金：

中国国家自然科学基金;

关键词：

magnetically ordered materials; heat capacity;

D O I：

10.1016/j.ssc.2005.02.009

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The specific heat of single-crystal NdMnO3 was investigated from 2 to 20 K under different magnetic fields up to 8 T. All the specific heat data show a Schottky-like anomaly, which becomes more indistinctive as increasing magnetic field. The experiment data were successfully fitted by taking into account factors such as crystal-field splitting, the two-level Schottky anomaly, the lattice vibration, and type-A anti ferromagnetic (A-AF) spin waves. It was found that the splitting of the ground state doublet of Nd3+ ion increases linearly with magnetic field. The above phenomena can be interpreted in terms of the model of unchanged effective molecular field at Nd3+ site caused by the ferromagnetic component of A-AF structure of Mn spins. This ferromagnetic component is likely caused by the GdFeO3-type octahedron rotation. In addition, it was also found that the magnetic field increases the spin-wave stiffness coefficient, but reduces the Debye temperature. (c) 2005 Elsevier Ltd. All rights reserved.

引用

页码：381 / 384

页数：4

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