Charge-neutral fermions and magnetic field-driven instability in insulating YbIr3Si7

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dc.citation.articleNumber394
dc.citation.journalTitleNature Communications
dc.citation.volumeNumber13
dc.contributor.authorSato, Y.
dc.contributor.authorSuetsugu, S.
dc.contributor.authorTominaga, T.
dc.contributor.authorKasahara, Y.
dc.contributor.authorKasahara, S.
dc.contributor.authorKobayashi, T.
dc.contributor.authorKitagawa, S.
dc.contributor.authorIshida, K.
dc.contributor.authorPeters, R.
dc.contributor.authorShibauchi, T.
dc.contributor.authorNevidomskyy, A. H.
dc.contributor.authorQian, L.
dc.contributor.authorMorosan, E.
dc.contributor.authorMatsuda, Y.
dc.date.accessioned2022-02-04T19:19:13Z
dc.date.available2022-02-04T19:19:13Z
dc.date.issued2022
dc.description.abstractKondo lattice materials, where localized magnetic moments couple to itinerant electrons, provide a very rich backdrop for strong electron correlations. They are known to realize many exotic phenomena, with a dramatic example being recent observations of quantum oscillations and metallic thermal conduction in insulators, implying the emergence of enigmatic charge-neutral fermions. Here, we show that thermal conductivity and specific heat measurements in insulating YbIr3Si7 reveal emergent neutral excitations, whose properties are sensitively changed by a field-driven transition between two antiferromagnetic phases. In the low-field phase, a significant violation of the Wiedemann-Franz law demonstrates that YbIr3Si7 is a charge insulator but a thermal metal. In the high-field phase, thermal conductivity exhibits a sharp drop below 300 mK, indicating a transition from a thermal metal into an insulator/semimetal driven by the magnetic transition. These results suggest that spin degrees of freedom directly couple to the neutral fermions, whose emergent Fermi surface undergoes a field-driven instability at low temperatures.
dc.identifier.citationSato, Y., Suetsugu, S., Tominaga, T., et al.. "Charge-neutral fermions and magnetic field-driven instability in insulating YbIr3Si7." <i>Nature Communications,</i> 13, (2022) Springer Nature: https://doi.org/10.1038/s41467-021-27541-9.
dc.identifier.digitals41467-021-27541-9
dc.identifier.doihttps://doi.org/10.1038/s41467-021-27541-9
dc.identifier.urihttps://hdl.handle.net/1911/111973
dc.language.isoeng
dc.publisherSpringer Nature
dc.rightsThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder.
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.titleCharge-neutral fermions and magnetic field-driven instability in insulating YbIr3Si7
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpublisher version
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