1984 年 53 巻 1 号 p. 55-58
The hyperfine fields of Ti47,49, Al27 and Ga69,71 in ferromagnetic Heusler alloys Co2TiAl and Co2TiGa are measured, and the Knight shifts of Al27 and Ga69,71 are also measured in the paramagnetic state above the Curie temperature. The hyperfine fields of Ti47,49 are −24.1±0.4 kOe in Co2TiAl and −26.6±0.4 kOe in Co2TiGa. They contrast with the positive fields of Co59. The hyperfine field of Al27 in Co2TiAl is −1.78±0.2 kOe and that of Ga69,71 in Co2TiGa is +2.76±0.2 kOe. The Knight shifts at high temperature limit are +0.06% for Al27 and +0.16% for Ga69,71. These small fields and Knight shifts originate from the reduction of the density of s electrons at Fermi level as seen for Al in alloys with transition elements.
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