Kondo Insulator to Semimetal Transformation Tuned by Spin-Orbit Coupling

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dc.citation.articleNumber246601
dc.citation.issueNumber24
dc.citation.journalTitlePhysical Review Letters
dc.citation.volumeNumber118
dc.contributor.authorDzsaber, S.
dc.contributor.authorProchaska, L.
dc.contributor.authorSidorenko, A.
dc.contributor.authorEguchi, G.
dc.contributor.authorSvagera, R.
dc.contributor.authorWaas, M.
dc.contributor.authorProkofiev, A.
dc.contributor.authorSi, Q.
dc.contributor.authorPaschen, S.
dc.date.accessioned2017-07-25T18:04:13Z
dc.date.available2017-07-25T18:04:13Z
dc.date.issued2017
dc.description.abstractRecent theoretical studies of topologically nontrivial electronic states in Kondo insulators have pointed to the importance of spin-orbit coupling (SOC) for stabilizing these states. However, systematic experimental studies that tune the SOC parameter λ SOC in Kondo insulators remain elusive. The main reason is that variations of (chemical) pressure or doping strongly influence the Kondo coupling J K and the chemical potential μ —both essential parameters determining the ground state of the material—and thus possible λ SOC tuning effects have remained unnoticed. Here, we present the successful growth of the substitution series Ce 3 Bi 4 ( Pt 1 − x Pd x ) 3 ( 0 ≤ x ≤ 1 ) of the archetypal (noncentrosymmetric) Kondo insulator Ce 3 Bi 4 Pt 3 . The Pt-Pd substitution is isostructural, isoelectronic, and isosize, and it therefore is likely to leave J K and μ essentially unchanged. By contrast, the large mass difference between the 5 d element Pt and the 4 d element Pd leads to a large difference in λ SOC , which thus is the dominating tuning parameter in the series. Surprisingly, with increasing x (decreasing λ SOC ), we observe a Kondo insulator to semimetal transition, demonstrating an unprecedented drastic influence of the SOC. The fully substituted end compound Ce 3 Bi 4 Pd 3 shows thermodynamic signatures of a recently predicted Weyl-Kondo semimetal.
dc.identifier.citationDzsaber, S., Prochaska, L., Sidorenko, A., et al.. "Kondo Insulator to Semimetal Transformation Tuned by Spin-Orbit Coupling." <i>Physical Review Letters,</i> 118, no. 24 (2017) American Physical Society: https://doi.org/10.1103/PhysRevLett.118.246601.
dc.identifier.digitalKondo_Insulator
dc.identifier.doihttps://doi.org/10.1103/PhysRevLett.118.246601
dc.identifier.urihttps://hdl.handle.net/1911/95220
dc.language.isoeng
dc.publisherAmerican Physical Society
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
dc.titleKondo Insulator to Semimetal Transformation Tuned by Spin-Orbit Coupling
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpublisher version
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