Thermally activated exchange narrowing of the Gd3+ ESR fine structure in a single crystal of Ce1-xGdxFe 4P12 (x-0.001) skutterudite
Autor(a) principal: | |
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Data de Publicação: | 2011 |
Outros Autores: | , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1103/PhysRevB.84.125116 http://hdl.handle.net/11449/226555 |
Resumo: | We report electron spin resonance (ESR) measurements in the Gd3+ doped semiconducting filled skutterudite compound Ce1-xGd xFe4P12 (x-0.001). As the temperature T varies from T- 150 K to T- 165 K, the Gd3+ ESR fine and hyperfine structures coalesce into a broad inhomogeneous single resonance. At T- 200 K the line narrows and as T increases further, the resonance becomes homogeneous with a thermal broadening of 1.1(2) Oe/K. These results suggest that the origin of these features may be associated with a subtle interdependence of thermally activated mechanisms that combine: (i) an increase with T of the density of activated conduction carriers across the T-dependent semiconducting pseudogap; (ii) the Gd3+ Korringa relaxation process due to an exchange interaction JfdS.s between the Gd3+ localized magnetic moments and the thermally activated conduction carriers; and (iii) a relatively weak confining potential of the rare earth ions inside the oversized (Fe 2P3)4 cage, which allows the rare earths to become rattler Einstein oscillators above T- 148 K. We argue that the rattling of the Gd3+ ions, via a motional narrowing mechanism, also contributes to the coalescence of the ESR fine and hyperfine structure. © 2011 American Physical Society. |
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Thermally activated exchange narrowing of the Gd3+ ESR fine structure in a single crystal of Ce1-xGdxFe 4P12 (x-0.001) skutteruditeWe report electron spin resonance (ESR) measurements in the Gd3+ doped semiconducting filled skutterudite compound Ce1-xGd xFe4P12 (x-0.001). As the temperature T varies from T- 150 K to T- 165 K, the Gd3+ ESR fine and hyperfine structures coalesce into a broad inhomogeneous single resonance. At T- 200 K the line narrows and as T increases further, the resonance becomes homogeneous with a thermal broadening of 1.1(2) Oe/K. These results suggest that the origin of these features may be associated with a subtle interdependence of thermally activated mechanisms that combine: (i) an increase with T of the density of activated conduction carriers across the T-dependent semiconducting pseudogap; (ii) the Gd3+ Korringa relaxation process due to an exchange interaction JfdS.s between the Gd3+ localized magnetic moments and the thermally activated conduction carriers; and (iii) a relatively weak confining potential of the rare earth ions inside the oversized (Fe 2P3)4 cage, which allows the rare earths to become rattler Einstein oscillators above T- 148 K. We argue that the rattling of the Gd3+ ions, via a motional narrowing mechanism, also contributes to the coalescence of the ESR fine and hyperfine structure. © 2011 American Physical Society.Instituto de Física Gleb Wataghin UNICAMP, C.P. 6165, Campinas-SP 13083-970UNESP-Universidade Estadual Paulista Departamento de Física Faculdade de Ciências, C.P. 473, Bauru-SP 17033-360Centro de Ciências Naturais e Humanas Universidade Federal Do ABC, Santo Andre-SP 09210-170University of California, Irvine, CA 92697Department of Physics Florida State University, Tallahassee, FL 32306San Diego State University, San Diego, CA 92182UNESP-Universidade Estadual Paulista Departamento de Física Faculdade de Ciências, C.P. 473, Bauru-SP 17033-360Universidade Estadual de Campinas (UNICAMP)Universidade Estadual Paulista (UNESP)Universidade Federal do ABC (UFABC)University of CaliforniaFlorida State UniversitySan Diego State UniversityGarcia, F. A.Venegas, P. A. [UNESP]Pagliuso, P. G.Rettori, C.Fisk, Z.Schlottmann, P.Oseroff, S. B.2022-04-29T01:14:04Z2022-04-29T01:14:04Z2011-09-09info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.1103/PhysRevB.84.125116Physical Review B - Condensed Matter and Materials Physics, v. 84, n. 12, 2011.1098-01211550-235Xhttp://hdl.handle.net/11449/22655510.1103/PhysRevB.84.1251162-s2.0-80053911009Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengPhysical Review B - Condensed Matter and Materials Physicsinfo:eu-repo/semantics/openAccess2024-04-25T17:40:00Zoai:repositorio.unesp.br:11449/226555Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-04-25T17:40Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Thermally activated exchange narrowing of the Gd3+ ESR fine structure in a single crystal of Ce1-xGdxFe 4P12 (x-0.001) skutterudite |
title |
Thermally activated exchange narrowing of the Gd3+ ESR fine structure in a single crystal of Ce1-xGdxFe 4P12 (x-0.001) skutterudite |
spellingShingle |
Thermally activated exchange narrowing of the Gd3+ ESR fine structure in a single crystal of Ce1-xGdxFe 4P12 (x-0.001) skutterudite Garcia, F. A. |
title_short |
Thermally activated exchange narrowing of the Gd3+ ESR fine structure in a single crystal of Ce1-xGdxFe 4P12 (x-0.001) skutterudite |
title_full |
Thermally activated exchange narrowing of the Gd3+ ESR fine structure in a single crystal of Ce1-xGdxFe 4P12 (x-0.001) skutterudite |
title_fullStr |
Thermally activated exchange narrowing of the Gd3+ ESR fine structure in a single crystal of Ce1-xGdxFe 4P12 (x-0.001) skutterudite |
title_full_unstemmed |
Thermally activated exchange narrowing of the Gd3+ ESR fine structure in a single crystal of Ce1-xGdxFe 4P12 (x-0.001) skutterudite |
title_sort |
Thermally activated exchange narrowing of the Gd3+ ESR fine structure in a single crystal of Ce1-xGdxFe 4P12 (x-0.001) skutterudite |
author |
Garcia, F. A. |
author_facet |
Garcia, F. A. Venegas, P. A. [UNESP] Pagliuso, P. G. Rettori, C. Fisk, Z. Schlottmann, P. Oseroff, S. B. |
author_role |
author |
author2 |
Venegas, P. A. [UNESP] Pagliuso, P. G. Rettori, C. Fisk, Z. Schlottmann, P. Oseroff, S. B. |
author2_role |
author author author author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual de Campinas (UNICAMP) Universidade Estadual Paulista (UNESP) Universidade Federal do ABC (UFABC) University of California Florida State University San Diego State University |
dc.contributor.author.fl_str_mv |
Garcia, F. A. Venegas, P. A. [UNESP] Pagliuso, P. G. Rettori, C. Fisk, Z. Schlottmann, P. Oseroff, S. B. |
description |
We report electron spin resonance (ESR) measurements in the Gd3+ doped semiconducting filled skutterudite compound Ce1-xGd xFe4P12 (x-0.001). As the temperature T varies from T- 150 K to T- 165 K, the Gd3+ ESR fine and hyperfine structures coalesce into a broad inhomogeneous single resonance. At T- 200 K the line narrows and as T increases further, the resonance becomes homogeneous with a thermal broadening of 1.1(2) Oe/K. These results suggest that the origin of these features may be associated with a subtle interdependence of thermally activated mechanisms that combine: (i) an increase with T of the density of activated conduction carriers across the T-dependent semiconducting pseudogap; (ii) the Gd3+ Korringa relaxation process due to an exchange interaction JfdS.s between the Gd3+ localized magnetic moments and the thermally activated conduction carriers; and (iii) a relatively weak confining potential of the rare earth ions inside the oversized (Fe 2P3)4 cage, which allows the rare earths to become rattler Einstein oscillators above T- 148 K. We argue that the rattling of the Gd3+ ions, via a motional narrowing mechanism, also contributes to the coalescence of the ESR fine and hyperfine structure. © 2011 American Physical Society. |
publishDate |
2011 |
dc.date.none.fl_str_mv |
2011-09-09 2022-04-29T01:14:04Z 2022-04-29T01:14:04Z |
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.84.125116 Physical Review B - Condensed Matter and Materials Physics, v. 84, n. 12, 2011. 1098-0121 1550-235X http://hdl.handle.net/11449/226555 10.1103/PhysRevB.84.125116 2-s2.0-80053911009 |
url |
http://dx.doi.org/10.1103/PhysRevB.84.125116 http://hdl.handle.net/11449/226555 |
identifier_str_mv |
Physical Review B - Condensed Matter and Materials Physics, v. 84, n. 12, 2011. 1098-0121 1550-235X 10.1103/PhysRevB.84.125116 2-s2.0-80053911009 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Physical Review B - Condensed Matter and Materials Physics |
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 |
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1799965121749975040 |