Neutron diffraction study of history dependence in MnFeP_0.6Si_0.4

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• 作者：Zhang ; L. ; Mo??e ; O. ; Proke?? ; K. ; Tegus ; O. ; Br??ck ; E.
• 刊名：Journal of Magnetism and Magnetic Materials
• 出版年：2005
• 出版时间：April, 2005
• 年：2005
• 卷：290-291
• 期：Part 1
• 页码：679-681
• 全文大小：151 K

文摘

In the MnFe(P,As) compounds which are promising magnetorefrigerant materials, we have studied the effect of Si substitution and successfully replaced As by Si. Surprisingly besides all the other changes, a peculiar history dependence of the magnetic phase transition was disclosed. The as-prepared sample shows a significantly lower transition temperature (namely a virgin T_C) than the sample that has experienced thermal cycling. The neutron diffraction patterns recorded during the first cooling manifest the first-order and magnetic-field-induced characters of the virgin phase transition. However, the refinement of the diffraction patterns does not provide evidence for atomic-position swapping, which might account for this history dependence.