Heavy-fermion quantum criticality and destruction of the Kondo effect in a nickelﾠoxypnictide

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dc.citation.firstpage777en_US
dc.citation.journalTitleNature Materialsen_US
dc.citation.lastpage781en_US
dc.citation.volumeNumber13en_US
dc.contributor.authorLuo, Yongkangen_US
dc.contributor.authorPourovskii, Leoniden_US
dc.contributor.authorRowley, S.E.en_US
dc.contributor.authorLi, Yukeen_US
dc.contributor.authorFeng, Chunmuen_US
dc.contributor.authorGeorges, Antoineen_US
dc.contributor.authorDai, Jianhuien_US
dc.contributor.authorCao, Guanghanen_US
dc.contributor.authorXu, Zhuﾒanen_US
dc.contributor.authorSi, Qimiaoen_US
dc.contributor.authorOng, N.P.en_US
dc.date.accessioned2015-07-08T19:59:45Zen_US
dc.date.available2015-07-08T19:59:45Zen_US
dc.date.issued2014en_US
dc.description.abstractA quantum critical point arises at a continuous transformation between distinct phases of matter at zero temperature. Studies in antiferromagnetic heavy-fermion materials have revealed that quantum criticality has several classes, with an unconventional type that involves a critical destruction of the Kondo entanglement [1,2]. To understand such varieties, it is important to extend the materials basis beyond the usual setting of intermetallic compounds. Here we show that a nickel oxypnictide, CeNiAsO, exhibits a heavy-fermion antiferromagnetic quantum critical point as a function of either pressure or P/As substitution. At the quantum critical point, non-Fermi-liquid behaviour appears, which is accompanied by a divergent effective carrier mass. Across the quantum critical point, the low-temperature Hall coefficient undergoes a rapid sign change, suggesting a sudden jump of the Fermi surface and a destruction of the Kondo effect [3,4]. Our results imply that the enormous materials basis for the oxypnictides, which has been so crucial in the search for high-temperature superconductivity, will also play a vital role in the effort to establish the universality classes of quantum criticality in strongly correlated electron systems.en_US
dc.identifier.citationLuo, Yongkang, Pourovskii, Leonid, Rowley, S.E., et al.. "Heavy-fermion quantum criticality and destruction of the Kondo effect in a nickelﾠoxypnictide." <i>Nature Materials,</i> 13, (2014) Nature Publishing Group: 777-781. http://dx.doi.org/10.1038/nmat3991.en_US
dc.identifier.doihttp://dx.doi.org/10.1038/nmat3991en_US
dc.identifier.urihttps://hdl.handle.net/1911/80847en_US
dc.language.isoengen_US
dc.publisherNature Publishing Groupen_US
dc.rightsThis is an author's peer-reviewed final manuscript, as accepted by the publisher. The published article is the Nature Publishing Group.en_US
dc.titleHeavy-fermion quantum criticality and destruction of the Kondo effect in a nickelﾠoxypnictideen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpost-printen_US
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