Slow crystalline electric field fluctuations in the Kondo lattice SmB6
dc.contributor.author | Carlone, M. [UNESP] | |
dc.contributor.author | Souza, J. C. | |
dc.contributor.author | Sichelschmidt, J. | |
dc.contributor.author | Rosa, P. F.S. | |
dc.contributor.author | Urbano, R. R. | |
dc.contributor.author | Pagliuso, P. G. | |
dc.contributor.author | Fisk, Z. | |
dc.contributor.author | Venegas, P. A. [UNESP] | |
dc.contributor.author | Schlottmann, P. | |
dc.contributor.author | Rettori, C. | |
dc.contributor.institution | Universidade Estadual Paulista (UNESP) | |
dc.contributor.institution | Universidade Estadual de Campinas (UNICAMP) | |
dc.contributor.institution | Max Planck Institute for Chemical Physics of Solids | |
dc.contributor.institution | Los Alamos National Laboratory | |
dc.contributor.institution | Florida State University | |
dc.date.accessioned | 2023-03-01T20:01:43Z | |
dc.date.available | 2023-03-01T20:01:43Z | |
dc.date.issued | 2022-05-15 | |
dc.description.abstract | This 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.affiliation | POSMAT-Programa de Pós-Graduação em Ciência e Tecnologia de Materiais Faculdade de Ciências Universidade Estadual Paulista-UNESP, SP, CP 473 | |
dc.description.affiliation | Instituto de Física Gleb Wataghin Unicamp, SP | |
dc.description.affiliation | Max Planck Institute for Chemical Physics of Solids | |
dc.description.affiliation | Los Alamos National Laboratory | |
dc.description.affiliation | Departamento de Física Universidade Estadual Paulista-Unesp, Caixa Postal 473, SP | |
dc.description.affiliation | Department of Physics Florida State University | |
dc.description.affiliationUnesp | POSMAT-Programa de Pós-Graduação em Ciência e Tecnologia de Materiais Faculdade de Ciências Universidade Estadual Paulista-UNESP, SP, CP 473 | |
dc.description.affiliationUnesp | Departamento de Física Universidade Estadual Paulista-Unesp, Caixa Postal 473, SP | |
dc.identifier | http://dx.doi.org/10.1103/PhysRevB.105.205116 | |
dc.identifier.citation | Physical Review B, v. 105, n. 20, 2022. | |
dc.identifier.doi | 10.1103/PhysRevB.105.205116 | |
dc.identifier.issn | 2469-9969 | |
dc.identifier.issn | 2469-9950 | |
dc.identifier.scopus | 2-s2.0-85130596978 | |
dc.identifier.uri | http://hdl.handle.net/11449/240106 | |
dc.language.iso | eng | |
dc.relation.ispartof | Physical Review B | |
dc.source | Scopus | |
dc.title | Slow crystalline electric field fluctuations in the Kondo lattice SmB6 | en |
dc.type | Artigo | pt |
dspace.entity.type | Publication | |
relation.isOrgUnitOfPublication | aef1f5df-a00f-45f4-b366-6926b097829b | |
relation.isOrgUnitOfPublication.latestForDiscovery | aef1f5df-a00f-45f4-b366-6926b097829b | |
unesp.campus | Universidade Estadual Paulista (UNESP), Faculdade de Ciências, Bauru | pt |