Abstract
Electrical resistivity, magnetization, and specific-heat measurements on the Heusler-type alloy Fe{sub 2}TiSn reveal the occurrence of weak ferromagnetism below 240 K and heavy fermion behavior with a quasiparticle effective mass of {approx}40 times the free electron mass. Ab initio electronic structure calculations, which are in good agreement with measured x-ray photoemission valence-band spectra, yield a nonmagnetic ground state with a pseudogap located at the Fermi level. Atomic disorder inferred from Rietveld refinement of powder x-ray-diffraction data and its effect on the calculated electronic structure suggest that the weak ferromagnetism and the heavy fermion behavior may be induced by atomic disorder in Fe{sub 2}TiSn and other Heusler alloys as well. (c) 2000 The American Physical Society.
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