Large Linear Negative Thermal Expansion in NiAs-type Magnetic Intermetallic Cr-Te-Se Compounds

Jiawang Xu; Xinqi Zheng; Shuxian Yang; Lei Xi; Shouguo Wang; Lei Zhang; Wenyun Yang; Jinbo Yang; Xiaobai Ma; Dongfeng Chen; Lunhua He; Sihao Deng; Jingyan Zhang; Yanfei Wu; Baogen Shen

doi:10.1021/acs.inorgchem.0c01048

Large Linear Negative Thermal Expansion in NiAs-type Magnetic Intermetallic Cr-Te-Se Compounds

Inorg Chem. 2020 Jun 15;59(12):8603-8608. doi: 10.1021/acs.inorgchem.0c01048. Epub 2020 May 28.

Authors

Jiawang Xu¹, Xinqi Zheng¹, Shuxian Yang^{1

2}, Lei Xi¹, Shouguo Wang¹, Lei Zhang³, Wenyun Yang⁴, Jinbo Yang⁴, Xiaobai Ma⁵, Dongfeng Chen⁵, Lunhua He^{1

2

6

7}, Sihao Deng⁷, Jingyan Zhang¹, Yanfei Wu¹, Baogen Shen^{1

2

6}

Affiliations

¹ Beijing Advanced Innovation Center for Materials Genome Engineering, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China.
² State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences & University of Chinese Academy of Sciences, Beijing 100190, China.
³ Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei 230031, China.
⁴ State Key Laboratory for Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, China.
⁵ Department of Nuclear Physics, China Institute of Atomic Energy, Beijing 102413, China.
⁶ Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China.
⁷ Spallation Neutron Source Science Center, Dongguan, Guangdong 523803, China.

PMID: 32462872
DOI: 10.1021/acs.inorgchem.0c01048

Abstract

A large linear negative thermal expansion (NTE) and expanded NTE temperature range (ΔT_NTE) were obtained in magnetoelastic CrTe_1-xSe_x (0 ≤ x ≤ 0.15) compounds. For CrTe compound, its thermal expansion coefficient of volume (α_V) was calculated to be -28.8 ppm K^-1 with the temperature ranging from 280 to 340 K. Substituting Te with Se atoms, the NTE behavior and magnetic properties can be well manipulated. With increasing Se in CrTe_1-xSe_x (0 ≤ x ≤ 0.15) compounds, the ΔT_NTE increases from 60 K (280-340 K for x = 0), to 80 K (240-320 K for x = 0.05), to 95 K (200-295 K for x = 0.1), and finally to 100 K (170-270 K for x = 0.15). Furthermore, a linear NTE remains independent of temperature for samples with x ≤ 0.1. The relationship between tunable NTE and magnetic properties was analyzed in detail, indicating that the NTE in CrTe_1-xSe_x compounds originates from the magnetovolume effect (MVE).