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Slow crystalline electric field fluctuations in the Kondo lattice SmB6

dc.contributor.authorCarlone, M. [UNESP]
dc.contributor.authorSouza, J. C.
dc.contributor.authorSichelschmidt, J.
dc.contributor.authorRosa, P. F.S.
dc.contributor.authorUrbano, R. R.
dc.contributor.authorPagliuso, P. G.
dc.contributor.authorFisk, Z.
dc.contributor.authorVenegas, P. A. [UNESP]
dc.contributor.authorSchlottmann, P.
dc.contributor.authorRettori, C.
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.contributor.institutionUniversidade Estadual de Campinas (UNICAMP)
dc.contributor.institutionMax Planck Institute for Chemical Physics of Solids
dc.contributor.institutionLos Alamos National Laboratory
dc.contributor.institutionFlorida State University
dc.date.accessioned2023-03-01T20:01:43Z
dc.date.available2023-03-01T20:01:43Z
dc.date.issued2022-05-15
dc.description.abstractThis work reports on the temperature dependence of the electron spin resonance (ESR) of Gd3+-doped SmB6 single crystals at X- and Q-band microwave frequencies in different crystallographic directions. We found an anomalous inhomogeneous broadening of the Gd3+ ESR linewidth (ΔH) within 5.3 K ≤T≤ 12.0 K which is attributed to slow crystalline electric field (CEF) fluctuations, slower than the timescale of the used ESR microwave frequencies (∼10GHz). This linewidth inhomogeneity may be associated to the coupling of the Gd3+S states to the breathing mode of the SmB6 cage and can be simulated by a random distribution of the 4th CEF parameter, b4, that strikingly takes negative and positive values. The temperature at which this inhomogeneity sets in is related to the onset of a continuous insulator-to-metal phase transition. In addition, based on the interconfigurational fluctuation relaxation model, the observed exponential T dependence of ΔH above T≃ 10 K gives rise to an excitation energy notably close to the hybridization gap of SmB6 (Δ≃ 60 K). This charge fluctuation scenario provides important ingredients to the physical properties of SmB6. We finally discuss the interplay between charge and valence fluctuations under the view of slow CEF fluctuations in SmB6 by coupling the Gd3+ ions to the breathing phonon mode via a dynamic Jahn-Teller-like mechanism.en
dc.description.affiliationPOSMAT-Programa de Pós-Graduação em Ciência e Tecnologia de Materiais Faculdade de Ciências Universidade Estadual Paulista-UNESP, SP, CP 473
dc.description.affiliationInstituto de Física Gleb Wataghin Unicamp, SP
dc.description.affiliationMax Planck Institute for Chemical Physics of Solids
dc.description.affiliationLos Alamos National Laboratory
dc.description.affiliationDepartamento de Física Universidade Estadual Paulista-Unesp, Caixa Postal 473, SP
dc.description.affiliationDepartment of Physics Florida State University
dc.description.affiliationUnespPOSMAT-Programa de Pós-Graduação em Ciência e Tecnologia de Materiais Faculdade de Ciências Universidade Estadual Paulista-UNESP, SP, CP 473
dc.description.affiliationUnespDepartamento de Física Universidade Estadual Paulista-Unesp, Caixa Postal 473, SP
dc.identifierhttp://dx.doi.org/10.1103/PhysRevB.105.205116
dc.identifier.citationPhysical Review B, v. 105, n. 20, 2022.
dc.identifier.doi10.1103/PhysRevB.105.205116
dc.identifier.issn2469-9969
dc.identifier.issn2469-9950
dc.identifier.scopus2-s2.0-85130596978
dc.identifier.urihttp://hdl.handle.net/11449/240106
dc.language.isoeng
dc.relation.ispartofPhysical Review B
dc.sourceScopus
dc.titleSlow crystalline electric field fluctuations in the Kondo lattice SmB6en
dc.typeArtigopt
dspace.entity.typePublication
relation.isOrgUnitOfPublicationaef1f5df-a00f-45f4-b366-6926b097829b
relation.isOrgUnitOfPublication.latestForDiscoveryaef1f5df-a00f-45f4-b366-6926b097829b
unesp.campusUniversidade Estadual Paulista (UNESP), Faculdade de Ciências, Baurupt

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