Crystal structures, phase relationships, and magnetic phase transitions of R5M4 compounds (R=rare earths, M=Si, Ge)
Ouyang Zhong-Wen (欧阳钟文), Rao Guang-Hui (饶光辉)
Chin. Phys. B, 2013, 22 (9):
Our recent studies of the crystal structures, phase transitions, and magnetic properties of intermetallic compounds R5M4 (R=rare earths; M=Si, Ge) are reviewed briefly. First, crystal structures, phase relationships, and magnetic properties of several 5:4 compounds, including Nd5Si4-xGex, Pr5Si4-xGex, Gd5-xLaxGe4, La5Si4, and Gd5Sn4, are presented. In particular, the canted spin structures as well as the magnetic phase transitions in Pr5Si2Ge2 and Pr5Ge4 investigated by neutron powder diffractions and small-angle neutron scattering are reviewed. Second, the crystal structures and magnetic properties of the most studied compounds Gd5(Si,Ge)4 are summarized. The focus is on the parent compound Gd5Ge4, which is an amazing material exhibiting magnetic anisotropy, angular dependent spin-flop transition, metastable magnetic response, Griffiths-like phase, thermal effect under pulsed fields, antiferromagnetic and ferromagnetic resonances, pronounced effects of impurities, and high-field induced magnetic transitions.