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The quaternary Heusler compound NiFeTiSn can be considered to be derived fromthe exotic pseudogap-compound Fe2TiSn by the replacement of one Fe atom by Ni.In contrast to Fe2TiSn, which shows a disorder-induced ferromagnetic phase, theground state of NiFeTiSn is antiferromagnetic with the signature of spincanting. Interestingly, NiFeTiSn shows a Griffiths-like phase characterized byisolated ferromagnetic clusters before attaining the antiferromagnetic state.The Griffiths-like phase is possibly associated with the antisite disorderbetween Fe and Ti sites as evident from our powder X-ray diffraction study. Thecompound also shows rather an unusual temperature dependence of resistivity,which can be accounted for by the prevailing structural disorder in the system.NiFeTiSn turned out to be a rare example where a Griffiths-like phase isobserved in a semiconducting 3d transition metal-based intermetallic compoundwith an antiferromagnetic ground state.

Observation of Griffiths-like phase in the quaternary Heusler compound NiFeTiSn