Matches in SemOpenAlex for { <https://semopenalex.org/work/W3096307201> ?p ?o ?g. }
- W3096307201 abstract "The predicted interplay between Kondo physics and nontrivial topology in SmB6 has stimulated many experimental reports, some of which are in apparent contradiction. The origin of the dispute may lie in the fragility of the Kondo insulating phase in the presence of Sm vacancies (Kondo holes) and/or natural impurities, such as Gd3+. In this work, we locally investigate this fragility for Al flux grown Sm1−xGdxB6 single crystals (0≤x≤0.02) by combining electron spin resonance (ESR) and complementary bulk measurements. The Gd3+ ESR spectra in a highly dilute regime (x∼0.0004) display the features of an insulating cubic environment. Remarkably, a metallic ESR line shape is observed for more concentrated samples (x≥0.004), even though these systems are still in a reasonably dilute regime and show insulating dc electrical resistivity. Our data indicate that the Kondo insulating state is destroyed locally around impurities before a global percolation occurs. This result not only explains the discrepancy between dc and ac conductivity but also provides a scenario to explain the presence of quantum oscillations in magnetization in the absence of quantum oscillations in electrical resistivity.Received 2 June 2020Accepted 7 October 2020DOI:https://doi.org/10.1103/PhysRevResearch.2.043181Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasKondo effectTopological insulatorsPhysical SystemsKondo insulatorsTechniquesElectron spin resonanceCondensed Matter & Materials Physics" @default.
- W3096307201 created "2020-11-09" @default.
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- W3096307201 date "2020-11-03" @default.
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- W3096307201 title "Metallic islands in the Kondo insulator <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:msub><mml:mrow><mml:mi>SmB</mml:mi></mml:mrow><mml:mn>6</mml:mn></mml:msub></mml:math>" @default.
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- W3096307201 doi "https://doi.org/10.1103/physrevresearch.2.043181" @default.
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