Structure and magnetic properties of RAlSi (R=light rare earth)

doi:10.1088/1674-1056/abe3e8

摘要/Abstract

摘要： We prepared the semimetals RAlSi (R,=,light rare earth), and systematically study their crystal structures and magnetic properties. X-ray diffractions confirm the coexistence of the site-disordered phase with group space of $I4_1/amd$ and the noncentrosymmetrically ordered phase with space group of $I4_1md$ in RAlSi alloy. The ordered phase is the main phase in RAlSi alloy. RAlSi alloys show nonmagnetic character for ${\rm R}={\rm La}$, low temperature ferromagnetic order for ${\rm R}={\rm Ce}$, Pr, and paramagnetic character for ${\rm R}={\rm Nd}$, respectively. SmAlSi shows metamagnetic transition at 10 K and ferromagnetic order at 143 K, respectively. SmAlSi follows the van Vleck paramagnetic model in its paramagnetic region. The magnetization curves of RAlSi (${\rm R}={\rm Ce}$, Pr, Sm) follow the mixed model of ferromagnetism and paramagnetism, and the fitted saturation moment $M_{\rm S}$ depends on the moment of trivalent rare earth. The paramagnetic susceptibility $\chi $ of RAlSi is going up with increasing the atomic order numbers of rare earth elements. This reveals that the magnetic property of RAlSi originates from the rare earth.

关键词: RAlSi, crystal structure, magnetic properties

Abstract: We prepared the semimetals RAlSi (R,=,light rare earth), and systematically study their crystal structures and magnetic properties. X-ray diffractions confirm the coexistence of the site-disordered phase with group space of $I4_1/amd$ and the noncentrosymmetrically ordered phase with space group of $I4_1md$ in RAlSi alloy. The ordered phase is the main phase in RAlSi alloy. RAlSi alloys show nonmagnetic character for ${\rm R}={\rm La}$, low temperature ferromagnetic order for ${\rm R}={\rm Ce}$, Pr, and paramagnetic character for ${\rm R}={\rm Nd}$, respectively. SmAlSi shows metamagnetic transition at 10 K and ferromagnetic order at 143 K, respectively. SmAlSi follows the van Vleck paramagnetic model in its paramagnetic region. The magnetization curves of RAlSi (${\rm R}={\rm Ce}$, Pr, Sm) follow the mixed model of ferromagnetism and paramagnetism, and the fitted saturation moment $M_{\rm S}$ depends on the moment of trivalent rare earth. The paramagnetic susceptibility $\chi $ of RAlSi is going up with increasing the atomic order numbers of rare earth elements. This reveals that the magnetic property of RAlSi originates from the rare earth.

Key words: RAlSi, crystal structure, magnetic properties

中图分类号: (Magnetic properties)

51.60.+a

75.50.-y (Studies of specific magnetic materials) 75.47.-m (Magnetotransport phenomena; materials for magnetotransport)

Tai Wang(王泰), Yongquan Guo(郭永权), and Cong Wang(王聪). Structure and magnetic properties of RAlSi (R=light rare earth)[J]. 中国物理B, 2021, 30(7): 75102-075102.

Tai Wang(王泰), Yongquan Guo(郭永权), and Cong Wang(王聪). Structure and magnetic properties of RAlSi (R=light rare earth)[J]. Chin. Phys. B, 2021, 30(7): 75102-075102.

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