【摘 要】
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We prepared the semimetals RAlSi (R =light rare earth),and systematically study their crystal structures and magnetic properties.X-ray diffractions confirm the
【机 构】
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School of Energy Power and Mechanical Engineering,North China Electric Power University,Beijing 1022
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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 I41/amd and the noncentrosymmetrically ordered phase with space group of I41md in RAlSi alloy.The ordered phase is the main phase in RAlSi alloy.RAlSi alloys show nonmagnetic character for R =La,low temperature ferromagnetic order for R =Ce,Pr,and paramagnetic character for R =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 (R =Ce,Pr,Sm) follow the mixed model of ferromagnetism and paramagnetism,and the fitted saturation moment Ms depends on the moment of trivalent rare earth.The paramagnetic susceptibility x 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.
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