Kondo hybridization and quantum criticality in β−YbAlB4 by laser ARPES

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dc.citation.articleNumber045112
dc.citation.issueNumber4
dc.citation.journalTitlePhysical Review B
dc.citation.volumeNumber97
dc.contributor.authorBareille, Cédric
dc.contributor.authorSuzuki, Shintaro
dc.contributor.authorNakayama, Mitsuhiro
dc.contributor.authorKuroda, Kenta
dc.contributor.authorNevidomskyy, Andriy H.
dc.contributor.authorMatsumoto, Yosuke
dc.contributor.authorNakatsuji, Satoru
dc.contributor.authorKondo, Takeshi
dc.contributor.authorShin, Shik
dc.contributor.orgCenter for Quantum Materials
dc.date.accessioned2018-07-02T18:19:43Z
dc.date.available2018-07-02T18:19:43Z
dc.date.issued2018
dc.description.abstractWe report an angle-resolved photoemission (ARPES) study of β−YbAlB4, which is known to harbor unconventional quantum criticality (QC) without any tuning. We directly observe a quasiparticle peak (QP) emerging from hybridization, characterized by a binding energy and an onset of coherence both at about 4 meV. This value conforms with a previously observed reduced Kondo scale at about 40 K. Consistency with an earlier study of carriers in β−YbAlB4 via the Hall effect strongly suggests that this QP is responsible for the QC in β−YbAlB4. A comparison with the sister polymorph α−YbAlB4, which is not quantum critical at ambient pressure, further supports this result. Indeed, within the limitation of our instrumental resolution, our ARPES measurements do not show tangible sign of hybridization in this locally isomorphic system, while the conduction band we observe is essentially the same as in β−YbAlB4. We therefore claim that we identified by ARPES the carriers responsible for the QC in β−YbAlB4. The observed dispersion and the underlying hybridization of this QP are discussed in the context of existing theoretical models.
dc.identifier.citationBareille, Cédric, Suzuki, Shintaro, Nakayama, Mitsuhiro, et al.. "Kondo hybridization and quantum criticality in β−YbAlB4 by laser ARPES." <i>Physical Review B,</i> 97, no. 4 (2018) American Physical Society: https://doi.org/10.1103/PhysRevB.97.045112.
dc.identifier.doihttps://doi.org/10.1103/PhysRevB.97.045112
dc.identifier.urihttps://hdl.handle.net/1911/102333
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 hybridization and quantum criticality in β−YbAlB4 by laser ARPES
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpublisher version
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