Magnetic structure and uniaxial negative thermal expansion in antiferromagnetic CrSb,Dalton Transactions

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Magnetic structure and uniaxial negative thermal expansion in antiferromagnetic CrSb
Dalton Transactions ( IF 3.5 ) Pub Date : 2020-11-17 , DOI: 10.1039/d0dt03277h
Jibao Yuan _{1,

2,

3,

4,

5} , Yuzhu Song _{1,

2,

3,

4,

5} , Xianran Xing _{3,

4,

5,

6} , Jun Chen _{1,

2,

3,

4,

5}

Affiliation

Negative thermal expansion (NTE) has been found in a growing number of ferromagnetic and ferrimagnetic materials; however, it remains a challenge to discover antiferromagnetic (AFM) NTE materials. Here, we report the uniaxial NTE properties of AFM intermetallic CrSb systematically, and reveal its uniaxial NTE mechanism for the first time. The present AFM intermetallic CrSb shows uniaxial NTE at high temperature and over a broad temperature window (α_a = −6.55 × 10⁻⁶ K⁻¹, 360–600 K). The direct experimental evidence of neutron powder diffraction reveals that NTE is induced by the AFM ordering of the Cr atom. The present study demonstrates that due to the transition from an AFM ordered structure to a paramagnetic disordered configuration, the negative contribution to the thermal expansion from the magnetovolume effect overwhelms the positive contribution from anharmonic phonon vibration. This study is of interest to find antiferromagnetic NTE materials.

中文翻译：

反铁磁CrSb的磁性结构和单轴负热膨胀

在越来越多的铁磁和亚铁磁材料中发现了负热膨胀（NTE）。然而，发现反铁磁（AFM）NTE材料仍然是一项挑战。在此，我们系统地报道了AFM金属间化合物CrSb的单轴NTE特性，并首次揭示了其单轴NTE机理。本AFM金属间华润雪花节目单轴NTE在高温和在宽的温度窗口（α_一个= -6.55×10 ^-6 ķ ^-1，360–600 K）。中子粉末衍射的直接实验证据表明，NTE是由Cr原子的AFM有序诱导的。本研究表明，由于从AFM有序结构到顺磁无序构型的过渡，磁粒效应对热膨胀的负贡献超过了非谐声子振动的正贡献。这项研究对于寻找反铁磁NTE材料很有意义。

更新日期：2020-11-27

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