Nuclear Magnetic Resonance in Heusler Alloys: Ni_2MnSn, Co_2MnSn and Ni_2MnSb

概要

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The internal magnetic fields of Mn and Sn nuclei in Ni_2MnSn, Co_2MnSn and Ni_2MnSb ware measured with the spin-echo N. M. R. method, as well as their thermo-magnetic curves. The Curie temperatures measured of Ni_2MnSn and Ni_2MnSb were different from Castellitz's data, and a sluggish change of the magnetization in Ni_2MnSb was observed, near the Curie temperature. The NMR signals of Mn nuclei were observed in Co_2MnSn, Ni_2MnSn and Ni_2MnSb. The internal magnetic fields were 352.3, 312.7 and 285kOe, respectively. An unexpected resonance signal appeared in Ni_2MnSb and was interpreted as originating from Mn atoms occupying non-regular sites. The resonance signals of Sn nuclei were also observed in Co_2MnSn and Ni_2MnSn. The internal magnetic fields were 153.8 and 150.4kOe, respectively. The difference in the internal magnetic fields of the above compounds from those of Cu_2MnSn can be tentatively attributed to the difference in the conduction electron polarization by RKKY interaction.
社団法人日本物理学会の論文
1970-02-05