Relationship between Spin Ordering, Entropy, and Anomalous Lattice Variation in Mn3Sn1?εSiεC1?δ Compounds

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• 作者：Jun Yan ; Ying Sun ; Yongchun Wen ; Lihua Chu ; Meimei Wu ; Qingzhen Huang ; Cong Wang ; Jeffrey W. Lynn ; Yunlin Chen
• 刊名：Inorganic Chemistry
• 出版年：2014
• 出版时间：February 17, 2014
• 年：2014
• 卷：53
• 期：4
• 页码：2317-2324
• 全文大小：522K
• ISSN：1520-510X

文摘

The crystal and magnetic structures of antiperovskite compounds Mn₃SnC, Mn₃Sn_0.95C_0.9, and Mn₃Sn_0.93Si_0.07C_0.94 were studied as a function of temperature and magnetic field by neutron powder diffraction. For Mn₃SnC, the magnetic field induces a dramatic variation of antiferromagnetic moment and lattice parameter. Because of this spin鈥搇attice coupling, the 鈥渟quare鈥?antiferromagnetic (AFM) structure plays a key role in inducing a negative thermal expansion in the material. Moreover, the thermal expansion parameter is closely related to the rate of change of the AFM moment, which can be controlled by introducing vacancies or by doping. The variations of the AFM moment and lattice parameter in Mn₃SnC with magnetic field make it possible to use the tunable properties for technical applications.