Magnetic transitions and magnetocaloric effect of Pr(Ga,Ge) compounds

Published

September 1, 2024

Author(s)

Hao Li, Xinqi Zheng, Hui Wu, Juping Xu, Yawei Gao, Dingsong Wang, Jiawang Xu, Shanshan Zhen, Jiahao Gao, Yang Pan, Guyue Wang, Jingyan Zhang, He Huang, Yanfei Wu, Wen Yin, Shouguo Wang, Baogen Shen

Abstract

PrGa compound was extensively studied due to its unique magnetic structure and magnetocaloric effect (MCE). In this study, the effect of Ge substitution for Ga atoms on the magnetic properties and MCE of the resulting Pr(Ga,Ge) compounds was systematically investigated by the combined magnetic measurements and neutron powder diffraction (NPD) experiments. Two magnetic transitions were identified for PrGa0.9Ge0.1, i.e., from ferromagnetic (FM) to FM at Tt = 26 K and from FM to paramagnetic (PM) at TC = 56 K.. PrGa0.8Ge0.2 shows similar magnetic transitions with Tt = 55 K and TC = 75 K. Diffraction experiments confirmed that the distance between the nearest neighboring Pr atoms decreases with increasing Ge content, which would enhance magnetic exchange interaction, and thus lead to an increased TC with Ge substitution. NPD experiments on PrGa0.9Ge0.1 also supported the similar FM-to-FM transition as previously observed in PrGa, indicating that Ge substitution would barely affect the form of magnetic structure in these compounds. Ge substitution exhibits a great influence on MCE regarding higher working temperatures, markedly extended work temperature span and comparable refrigerant capacity, hence, is beneficial for practical applications at liquid nitrogen temperatures.

Citation

Scripta Materialia

Volume

250

Pub Type

Journals

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Keywords

RGa compounds, Magnetic structure, Neutron diffraction, Magnetocaloric effect

Citation

Li, H. , Zheng, X. , Wu, H. , Xu, J. , Gao, Y. , Wang, D. , Xu, J. , Zhen, S. , Gao, J. , Pan, Y. , Wang, G. , Zhang, J. , Huang, H. , Wu, Y. , Yin, W. , Wang, S. and Shen, B. (2024), Magnetic transitions and magnetocaloric effect of Pr(Ga,Ge) compounds, Scripta Materialia, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=957689 (Accessed December 13, 2024)