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Crystal structures, phase relationships, and magnetic phase transitions of R5M4 compounds （R = rare earths, M = Si, Ge）

ISSN号：1674-1056
期刊名称：《中国物理B：英文版》
分类：O614.121[理学—无机化学;理学—化学] TG146.23[金属学及工艺—金属材料;一般工业技术—材料科学与工程;金属学及工艺—金属学]
作者机构：[1]Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, China, [2]School of Materials Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China
相关基金：Project supported by the National Natural Science Foundation of China （Grants Nos. 50025102 and 50631040）, the National Basic Research Program of China （Grant No. 2006CB601101）, the Exchange Program between NIST and the Chinese Academy of Sciences, and the Natural Science Foundation of Guangxi Province, China （Grant No. 2012GXNSFGA060002）.

关键词：金属间化合物, 晶体结构, 反铁磁性, 相位关系, 磁相变, 稀土, 硅, 锗, crystal structure, phase relationship, magnetic phase transition

中文摘要：

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 Nd5Si4xGex , Pr5Si4xGex, Gd5xLaxGe4,La5Si4, and Gd5Sn4 , are presented. In particular, the canted spin structures as well as the magnetic phase transitions in Pr5Si2Ge2 and Pr 5 Ge 4 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.

英文摘要：

Our recent studies of the crystal structures, phase transitions, and magnetic properties of intermetallic compounds RsM4 （R = rare earths; M = Si, Ge） are reviewed briefly. First, crystal structures, phase relationships, and magnetic prop- erties of several 5：4 compounds, including Nd5 Si4-xGex, Pr5 Si4_xGex, Gds-xLaxGe4, La5 Si4, and Gd5 Sn4, are presented. In particular, the canted spin structures as well as the magnetic phase transitions in PrsSi2Ge2 and PrsGe4 investigated by neutron powder diffractions and small-angle neutron scattering are reviewed. Second, the crystal structures and magnetic properties of the most studied compounds Gds（Si,Ge）4 are summarized. The focus is on the parent compound GdsGe4, 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, pro- nounced effects of impurities, and high-field induced magnetic transitions.

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