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 and the noncentrosymmetrically ordered phase with space group of in RAlSi alloy. The ordered phase is the main phase in RAlSi alloy. RAlSi alloys show nonmagnetic character for , low temperature ferromagnetic order for , Pr, and paramagnetic character for , 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 (, Pr, Sm) follow the mixed model of ferromagnetism and paramagnetism, and the fitted saturation moment depends on the moment of trivalent rare earth. The paramagnetic susceptibility 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.
Tai Wang(王泰), Yongquan Guo(郭永权), and Cong Wang(王聪) Structure and magnetic properties of RAlSi (R=light rare earth) 2021 Chin. Phys. B 30 075102
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