Magnetic resonance probing of ground state in the mixed valence correlated topological insulator SmB6

Abstract Introducing of topological insulator concept for fluctuating valence compound – samarium hexaboride – has recently initiated a new round of studies aimed to clarify the nature of the ground state in this extraordinary system with strong electron correlations. Here we discuss the data of mag...

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Autores principales:	S. V. Demishev, M. I. Gilmanov, A. N. Samarin, A. V. Semeno, N. E. Sluchanko, N. A. Samarin, A. V. Bogach, N. Yu. Shitsevalova, V. B. Filipov, M. S. Karasev, V. V. Glushkov
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Lenguaje:	EN
Publicado:	Nature Portfolio 2018
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/b26175ead1d5402d838c360c694fc639
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spelling	oai:doaj.org-article:b26175ead1d5402d838c360c694fc6392021-12-02T11:41:14ZMagnetic resonance probing of ground state in the mixed valence correlated topological insulator SmB610.1038/s41598-018-25464-y2045-2322https://doaj.org/article/b26175ead1d5402d838c360c694fc6392018-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-25464-yhttps://doaj.org/toc/2045-2322Abstract Introducing of topological insulator concept for fluctuating valence compound – samarium hexaboride – has recently initiated a new round of studies aimed to clarify the nature of the ground state in this extraordinary system with strong electron correlations. Here we discuss the data of magnetic resonance in the pristine single crystals of SmB6 measured in 60 GHz cavity experiments at temperatures 1.8–300 K. The microwave study as well as the DC resistivity and Hall effect measurements performed for the different states of SmB6 [110] surface prove definitely the existence of the layer with metallic conductivity increasing under lowering temperature below 5 K. Four lines with the g-factors g ≈ 2 are found to contribute to the ESR-like absorption spectrum that may be attributed to intrinsic paramagnetic centers on the sample’s surface, which are robust with respect to the surface treatment. The temperature dependence of integrated intensity I(T) for main paramagnetic signal is found to demonstrate anomalous critical behavior I(T) ~ (T * − T)ν with characteristic temperature T * = 5.34 ± 0.05 K and exponent ν = 0.38 ± 0.03 indicating possible magnetic transition at the SmB6 [110] surface. Additional resonant magnetoabsorption line, which may be associated with either donor-like defects or cyclotron resonance mode corresponding to the mass m c ~ 1.2m 0, is reported.S. V. DemishevM. I. GilmanovA. N. SamarinA. V. SemenoN. E. SluchankoN. A. SamarinA. V. BogachN. Yu. ShitsevalovaV. B. FilipovM. S. KarasevV. V. GlushkovNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-8 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q S. V. Demishev M. I. Gilmanov A. N. Samarin A. V. Semeno N. E. Sluchanko N. A. Samarin A. V. Bogach N. Yu. Shitsevalova V. B. Filipov M. S. Karasev V. V. Glushkov Magnetic resonance probing of ground state in the mixed valence correlated topological insulator SmB6
description	Abstract Introducing of topological insulator concept for fluctuating valence compound – samarium hexaboride – has recently initiated a new round of studies aimed to clarify the nature of the ground state in this extraordinary system with strong electron correlations. Here we discuss the data of magnetic resonance in the pristine single crystals of SmB6 measured in 60 GHz cavity experiments at temperatures 1.8–300 K. The microwave study as well as the DC resistivity and Hall effect measurements performed for the different states of SmB6 [110] surface prove definitely the existence of the layer with metallic conductivity increasing under lowering temperature below 5 K. Four lines with the g-factors g ≈ 2 are found to contribute to the ESR-like absorption spectrum that may be attributed to intrinsic paramagnetic centers on the sample’s surface, which are robust with respect to the surface treatment. The temperature dependence of integrated intensity I(T) for main paramagnetic signal is found to demonstrate anomalous critical behavior I(T) ~ (T * − T)ν with characteristic temperature T * = 5.34 ± 0.05 K and exponent ν = 0.38 ± 0.03 indicating possible magnetic transition at the SmB6 [110] surface. Additional resonant magnetoabsorption line, which may be associated with either donor-like defects or cyclotron resonance mode corresponding to the mass m c ~ 1.2m 0, is reported.
format	article
author	S. V. Demishev M. I. Gilmanov A. N. Samarin A. V. Semeno N. E. Sluchanko N. A. Samarin A. V. Bogach N. Yu. Shitsevalova V. B. Filipov M. S. Karasev V. V. Glushkov
author_facet	S. V. Demishev M. I. Gilmanov A. N. Samarin A. V. Semeno N. E. Sluchanko N. A. Samarin A. V. Bogach N. Yu. Shitsevalova V. B. Filipov M. S. Karasev V. V. Glushkov
author_sort	S. V. Demishev
title	Magnetic resonance probing of ground state in the mixed valence correlated topological insulator SmB6
title_short	Magnetic resonance probing of ground state in the mixed valence correlated topological insulator SmB6
title_full	Magnetic resonance probing of ground state in the mixed valence correlated topological insulator SmB6
title_fullStr	Magnetic resonance probing of ground state in the mixed valence correlated topological insulator SmB6
title_full_unstemmed	Magnetic resonance probing of ground state in the mixed valence correlated topological insulator SmB6
title_sort	magnetic resonance probing of ground state in the mixed valence correlated topological insulator smb6
publisher	Nature Portfolio
publishDate	2018
url	https://doaj.org/article/b26175ead1d5402d838c360c694fc639
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Magnetic resonance probing of ground state in the mixed valence correlated topological insulator SmB6

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