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Native defects and impurity band behavior in half-Heusler thermoelectric NbFeSb

Abstract

To investigate the electronic behavior and magnetic properties of NbFeSb, we have performed 93Nb NMR, specific heat and magnetic measurements on NbFeSb samples heat treated at high temperatures. Magnetic measurements, combined with an observed Schottky anomaly and changes in the NMR line width indicate the presence of a 0.2% concentrated native magnetic defect in stoichiometric NbFeSb samples. The origin of these native defects is believed due to Fe antisites on Nb sites. In addition, NMR shift and spin-lattice relaxation results below 200 K reveal a Korringa-like response indicating heavily-doped p-type behavior due to native defects. Above 280 K this goes over to an activated behavior indicating the presence of an impurity band, empty at low temperatures, which is located around 0.03 eV above valence band maximum.

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Publication details

The article was received on 07 Jul 2018, accepted on 07 Aug 2018 and first published on 07 Aug 2018


Article type: Paper
DOI: 10.1039/C8CP04287J
Citation: Phys. Chem. Chem. Phys., 2018, Accepted Manuscript
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    Native defects and impurity band behavior in half-Heusler thermoelectric NbFeSb

    Y. Tian, H. Zhu, W. Ren, N. Ghassemi, E. Conant, Z. Wang, Z. Ren and J. Ross, Phys. Chem. Chem. Phys., 2018, Accepted Manuscript , DOI: 10.1039/C8CP04287J

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