An effect of Sm vacancies on the hybridization gap in topological Kondo insulator candidate SmB^sub 6

A necessary element for the predicted topological state in Kondo insulator SmB6 is the hybridization gap which opens in this compound at low temperatures. In this work, we present a comparative study of the in-gap density of states due to Sm vacancies by Raman scattering spectroscopy and heat capaci...

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Veröffentlicht in:	Physica. B, Condensed matter Condensed matter, 2018-05, Vol.536, p.60
Hauptverfasser:	Valentine, Michael E, Koohpayeh, Seyed, Phelan, W Adam, McQueen, Tyrel M, Rosa, Priscila FS, Fisk, Zachary, Drichko, Natalia
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Sprache:	eng
Schlagworte:	Band gap Hybridization Insulation Kondo effect Raman spectra Samarium Scattering Specific heat Topology Vacancies
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creator	Valentine, Michael E Koohpayeh, Seyed Phelan, W Adam McQueen, Tyrel M Rosa, Priscila FS Fisk, Zachary Drichko, Natalia
description	A necessary element for the predicted topological state in Kondo insulator SmB6 is the hybridization gap which opens in this compound at low temperatures. In this work, we present a comparative study of the in-gap density of states due to Sm vacancies by Raman scattering spectroscopy and heat capacity for samples where the number of Sm vacancies is equal to or below 1%. We demonstrate that hybridization gap is very sensitive to the presence of Sm vacancies. At the amount of vacancies above 1% the gap fills in with impurity states and low temperature heat capacity is enhanced.
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subjects	Band gap Hybridization Insulation Kondo effect Raman spectra Samarium Scattering Specific heat Topology Vacancies
title	An effect of Sm vacancies on the hybridization gap in topological Kondo insulator candidate SmB^sub 6
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