Temperature induced spin-reorientation in pseudobinary alloy Hf0.82Ta0.18Fe2:a Mssbauer spectral study

HUANG Yanjun LI Shuzhen CHEN Nan XIA Yuanfu

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Temperature induced spin-reorientation in pseudobinary alloy Hf_0.82Ta_0.18Fe₂:a Mssbauer spectral study

更新时间：2021-03-12

- Temperature induced spin-reorientation in pseudobinary alloy Hf_0.82Ta_0.18Fe₂:a Mssbauer spectral study
- NUCLEAR TECHNIQUES Issue 4, (2007)
- 作者机构：
  
  1. 南京大学物理系
  2. 南京大学物理系,南京,210093
- 作者简介：
- 基金信息：
  
  国家自然科学基金(20050284003)资助
- DOI：
  CLC： O481.4
- Published：01 April 2007
- 稿件说明：
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[1]黄彦君,厉淑贞,陈楠,夏元复.伪双元合金Hf_(0.82)Ta_(0.18)Fe_2温度诱导自旋重取向的穆斯堡尔研究[J].核技术,2007(04):297-301.

HUANG Yanjun LI Shuzhen CHEN Nan XIA Yuanfu. Temperature induced spin-reorientation in pseudobinary alloy Hf_0.82Ta_0.18Fe₂:a Mssbauer spectral study[J]. Nuclear techniques, 2007, (4): 297-301.
[1]黄彦君,厉淑贞,陈楠,夏元复.伪双元合金Hf_(0.82)Ta_(0.18)Fe_2温度诱导自旋重取向的穆斯堡尔研究[J].核技术,2007(04):297-301. DOI：

HUANG Yanjun LI Shuzhen CHEN Nan XIA Yuanfu. Temperature induced spin-reorientation in pseudobinary alloy Hf_0.82Ta_0.18Fe₂:a Mssbauer spectral study[J]. Nuclear techniques, 2007, (4): 297-301. DOI：

摘要

制备了伪双元合金Hf0.82Ta0.18Fe2。X射线衍射表明

合金为C14型Laves相结构

晶格常数为a=4.92133（3）

c=8.0488（1）。在温度20K～380K范围内测量了穆斯堡尔谱。表明合金随温度存在两个磁相变点

一个从顺磁态（PM）到反铁磁态（AFM）

相变温度为330K

另一个从反铁磁（AFM）到铁磁态（FM）

相变温度约为180K。在AFM-FM相变点

6h位Fe原子自旋方向发生翻转

从沿c方向转向ab平面。相应地

2a位的Fe原子

在AFM态为顺磁性

经过该相变后

相应地呈现铁磁性排列。

Abstract

The pseudobinary alloy Hf0.82Ta0.18Fe2 was prepared by arc melting and annealing technique. X-ray powder diffraction indicated a C14-type Laves phase structure with the crystal parameters a = 4.92133(3) and c = 8.0488(1). The Mssbauer spectra were measured at different temperatures between 20 K and 380 K

and showed two magnetic phase transitions

one from paramagnetic state to antiferromagnetic state at about 330 K and the other from antiferromagnetic state to ferromagnetic state at about 180 K. The latter transition indicated a spin-reorientation for 6h site Fe atoms

thus

the Fe atom spin at 6h turn to ab plane from c axis. However

the Fe atoms at 2a also showed a magnetic moment in ferromagnetic state.

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