Abstract
In order to study the origin of the positive hyperfine field at Co nucleus in the Heusler alloy Co 2 TiSn, the dependences of the magnetization and the NMR spectrum upon substitution of Ni or Fe for Co were measured. The Co atom which has more than one Ni atom at neighboring Co sites did not contribute to the ferromagnetic moment. The Ni atoms were non-magnetic. Both Co and Fe atoms remained magnetic in the Fe substituted alloys. The contributions to the hyperfine field at Co nucleus from the magnetic moment of the parent atom and from the neighboring magnetic atoms were separated to be +3 and +18 kOe, respectively in Co 2 TiSn.
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