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The origin of large low-temperature specific heat in an Er–Cu–Ga magnetic regenerator material.

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Název: The origin of large low-temperature specific heat in an Er–Cu–Ga magnetic regenerator material.
Autoři: Chen, Yangmin, Zhou, Wenbin, Zhang, Pengna, Gao, Yawei, Yang, Wenyun, Yang, Jinbo, Zheng, Xinqi, Liu, Jian
Zdroj: Journal of Applied Physics; 9/14/2025, Vol. 138 Issue 10, p1-9, 9p
Témata: LOW temperatures, SPECIFIC heat, MAGNETIC structure, ERBIUM compounds, PHASE transitions, NUCLEAR spin, ANTIFERROMAGNETISM
Abstrakt: In this work, the low-temperature volumetric specific heat, magnetic structure, and phase transition of the ErCu0.92Ga0.08 intermetallic alloy are investigated. It is found that ErCu0.92Ga0.08 exhibits a maximum specific heat of 0.96 J/(K cm3) at 15.9 K, which surpasses that of a commercial Pb material used as a regenerator in cryocoolers. Two successive magnetic phase transitions, namely, antiferromagnetic-to-paramagnetic transition and antiferromagnetic spin-reorientation transition, are observed in ErCu0.92Ga0.08 via Neutron Powder Diffraction. The anomalous specific heat behavior can be ascribed to the spin-reorientation transition. Based on the findings, it is believed that ErCu0.92Ga0.08 can be a new magnetic regenerator material for low-temperature cryocoolers. [ABSTRACT FROM AUTHOR]
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Databáze: Complementary Index
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Abstrakt:In this work, the low-temperature volumetric specific heat, magnetic structure, and phase transition of the ErCu<subscript>0.92</subscript>Ga<subscript>0.08</subscript> intermetallic alloy are investigated. It is found that ErCu<subscript>0.92</subscript>Ga<subscript>0.08</subscript> exhibits a maximum specific heat of 0.96 J/(K cm<sup>3</sup>) at 15.9 K, which surpasses that of a commercial Pb material used as a regenerator in cryocoolers. Two successive magnetic phase transitions, namely, antiferromagnetic-to-paramagnetic transition and antiferromagnetic spin-reorientation transition, are observed in ErCu<subscript>0.92</subscript>Ga<subscript>0.08</subscript> via Neutron Powder Diffraction. The anomalous specific heat behavior can be ascribed to the spin-reorientation transition. Based on the findings, it is believed that ErCu<subscript>0.92</subscript>Ga<subscript>0.08</subscript> can be a new magnetic regenerator material for low-temperature cryocoolers. [ABSTRACT FROM AUTHOR]
ISSN:00218979
DOI:10.1063/5.0280199