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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Nature Portfolio
2018-05-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-018-25464-y |
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| 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 |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-12-18T05:19:28Z |
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| id | doaj.art-b26175ead1d5402d838c360c694fc639 |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-12-18T05:19:28Z |
| publishDate | 2018-05-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-b26175ead1d5402d838c360c694fc6392022-12-21T21:19:42ZengNature PortfolioScientific Reports2045-23222018-05-01811810.1038/s41598-018-25464-yMagnetic resonance probing of ground state in the mixed valence correlated topological insulator SmB6S. V. Demishev0M. I. Gilmanov1A. N. Samarin2A. V. Semeno3N. E. Sluchanko4N. A. Samarin5A. V. Bogach6N. Yu. Shitsevalova7V. B. Filipov8M. S. Karasev9V. V. Glushkov10Moscow Institute of Physics and Technology, DolgoprudnyMoscow Institute of Physics and Technology, DolgoprudnyProkhorov General Physics Institute of the Russian Academy of SciencesMoscow Institute of Physics and Technology, DolgoprudnyMoscow Institute of Physics and Technology, DolgoprudnyProkhorov General Physics Institute of the Russian Academy of SciencesProkhorov General Physics Institute of the Russian Academy of SciencesInstitute for Problems of Materials Science of NASUInstitute for Problems of Materials Science of NASUProkhorov General Physics Institute of the Russian Academy of SciencesMoscow Institute of Physics and Technology, DolgoprudnyAbstract 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.https://doi.org/10.1038/s41598-018-25464-y |
| spellingShingle | 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 Scientific Reports |
| title | 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_short | 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 |
| url | https://doi.org/10.1038/s41598-018-25464-y |
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