Nuclear quadrupole resonance study of the electronic properties of the narrow-gap semiconductor FeSb₂

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T. Koyama, Y. Fukui, Y. Muro, T. Nagao, H. Nakamura, and T. Kohara
Graduate School of Material Science, University of Hyogo, Kamigori, Ako-gun, Hyogo 678-1297, Japan

Received 2 April 2007; revised 18 June 2007; published 24 August 2007

Electronicproperties of the narrow-gap semiconductor FeSb₂ have been studied bythe magnetization and ^121/123Sb nuclear quadrupole resonance measurements. In additionto the susceptibility, the spin-lattice relaxation rate has revealed afully opened gap at the Fermi level. The relaxation processis dominated by the magnetic contribution at high temperature T,while the quadrupole contribution becomes dominant below 70 K. Electronic fieldgradient at Sb sites shows anisotropic T dependence, reflecting mostprobably the anisotropic thermal expansion.

URL:	http://link.aps.org/doi/10.1103/PhysRevB.76.073203
DOI:	10.1103/PhysRevB.76.073203
PACS:	72.20.-i; 75.50.Bb; 76.60.-k 72.20.-i Electrical conductivity phenomena in semiconductors and insulators 75.50.Bb Ferromagnetism of Fe and its alloys 76.60.-k Nuclear magnetic resonance and relaxation (condensed matter) YEAR: 2007
KEYWORDS:	electric field gradient, energy gap, Fermi level, ferromagnetic materials, iron compounds, magnetic semiconductors, magnetic susceptibility, magnetisation, narrow band gap semiconductors, nuclear quadrupole resonance, nuclear spin-lattice relaxation, quadrupole interactions, thermal expansion

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