Slow crystalline electric field fluctuations in the Kondo lattice SmB6
Autor(a) principal: | |
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Data de Publicação: | 2022 |
Outros Autores: | , , , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1103/PhysRevB.105.205116 http://hdl.handle.net/11449/240106 |
Resumo: | 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. |
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Repositório Institucional da UNESP |
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spelling |
Slow crystalline electric field fluctuations in the Kondo lattice SmB6This 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.POSMAT-Programa de Pós-Graduação em Ciência e Tecnologia de Materiais Faculdade de Ciências Universidade Estadual Paulista-UNESP, SP, CP 473Instituto de Física Gleb Wataghin Unicamp, SPMax Planck Institute for Chemical Physics of SolidsLos Alamos National LaboratoryDepartamento de Física Universidade Estadual Paulista-Unesp, Caixa Postal 473, SPDepartment of Physics Florida State UniversityPOSMAT-Programa de Pós-Graduação em Ciência e Tecnologia de Materiais Faculdade de Ciências Universidade Estadual Paulista-UNESP, SP, CP 473Departamento de Física Universidade Estadual Paulista-Unesp, Caixa Postal 473, SPUniversidade Estadual Paulista (UNESP)Universidade Estadual de Campinas (UNICAMP)Max Planck Institute for Chemical Physics of SolidsLos Alamos National LaboratoryFlorida State UniversityCarlone, M. [UNESP]Souza, J. C.Sichelschmidt, J.Rosa, P. F.S.Urbano, R. R.Pagliuso, P. G.Fisk, Z.Venegas, P. A. [UNESP]Schlottmann, P.Rettori, C.2023-03-01T20:01:43Z2023-03-01T20:01:43Z2022-05-15info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.1103/PhysRevB.105.205116Physical Review B, v. 105, n. 20, 2022.2469-99692469-9950http://hdl.handle.net/11449/24010610.1103/PhysRevB.105.2051162-s2.0-85130596978Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengPhysical Review Binfo:eu-repo/semantics/openAccess2023-03-01T20:01:44Zoai:repositorio.unesp.br:11449/240106Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462023-03-01T20:01:44Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Slow crystalline electric field fluctuations in the Kondo lattice SmB6 |
title |
Slow crystalline electric field fluctuations in the Kondo lattice SmB6 |
spellingShingle |
Slow crystalline electric field fluctuations in the Kondo lattice SmB6 Carlone, M. [UNESP] |
title_short |
Slow crystalline electric field fluctuations in the Kondo lattice SmB6 |
title_full |
Slow crystalline electric field fluctuations in the Kondo lattice SmB6 |
title_fullStr |
Slow crystalline electric field fluctuations in the Kondo lattice SmB6 |
title_full_unstemmed |
Slow crystalline electric field fluctuations in the Kondo lattice SmB6 |
title_sort |
Slow crystalline electric field fluctuations in the Kondo lattice SmB6 |
author |
Carlone, M. [UNESP] |
author_facet |
Carlone, M. [UNESP] Souza, J. C. Sichelschmidt, J. Rosa, P. F.S. Urbano, R. R. Pagliuso, P. G. Fisk, Z. Venegas, P. A. [UNESP] Schlottmann, P. Rettori, C. |
author_role |
author |
author2 |
Souza, J. C. Sichelschmidt, J. Rosa, P. F.S. Urbano, R. R. Pagliuso, P. G. Fisk, Z. Venegas, P. A. [UNESP] Schlottmann, P. Rettori, C. |
author2_role |
author author author author author author author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (UNESP) Universidade Estadual de Campinas (UNICAMP) Max Planck Institute for Chemical Physics of Solids Los Alamos National Laboratory Florida State University |
dc.contributor.author.fl_str_mv |
Carlone, M. [UNESP] Souza, J. C. Sichelschmidt, J. Rosa, P. F.S. Urbano, R. R. Pagliuso, P. G. Fisk, Z. Venegas, P. A. [UNESP] Schlottmann, P. Rettori, C. |
description |
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. |
publishDate |
2022 |
dc.date.none.fl_str_mv |
2022-05-15 2023-03-01T20:01:43Z 2023-03-01T20:01:43Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1103/PhysRevB.105.205116 Physical Review B, v. 105, n. 20, 2022. 2469-9969 2469-9950 http://hdl.handle.net/11449/240106 10.1103/PhysRevB.105.205116 2-s2.0-85130596978 |
url |
http://dx.doi.org/10.1103/PhysRevB.105.205116 http://hdl.handle.net/11449/240106 |
identifier_str_mv |
Physical Review B, v. 105, n. 20, 2022. 2469-9969 2469-9950 10.1103/PhysRevB.105.205116 2-s2.0-85130596978 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Physical Review B |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1799964427352539136 |