Exchange and crystal field effects in the ESR spectra of Eu2+ in la B6
Autor(a) principal: | |
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Data de Publicação: | 2007 |
Outros Autores: | , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1103/PhysRevB.76.125114 http://hdl.handle.net/11449/224963 |
Resumo: | Electron spin resonance of Eu2+ (4 f7, S=7 2) in a La hexaboride (La B6) single crystal shows a single anisotropic Dysonian resonance. From the observed negative g shift of the resonance, it is inferred that the Eu2+ ions are covalent exchange coupled to the B 2p -like host conduction electrons. From the anisotropy of the spectra (linewidth and field for resonance), we found that the S ground state of Eu2+ ions experience a cubic crystal field of a negative fourth order crystal field parameter (CFP), b4 =-11.5 (2.0) Oe, in agreement with the negative fourth order CFP, A4, found for the non- S ground state R hexaborides. These results support covalency as the dominant contribution to the fourth order CFP for the whole R hexaboride family. © 2007 The American Physical Society. |
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Exchange and crystal field effects in the ESR spectra of Eu2+ in la B6Electron spin resonance of Eu2+ (4 f7, S=7 2) in a La hexaboride (La B6) single crystal shows a single anisotropic Dysonian resonance. From the observed negative g shift of the resonance, it is inferred that the Eu2+ ions are covalent exchange coupled to the B 2p -like host conduction electrons. From the anisotropy of the spectra (linewidth and field for resonance), we found that the S ground state of Eu2+ ions experience a cubic crystal field of a negative fourth order crystal field parameter (CFP), b4 =-11.5 (2.0) Oe, in agreement with the negative fourth order CFP, A4, found for the non- S ground state R hexaborides. These results support covalency as the dominant contribution to the fourth order CFP for the whole R hexaboride family. © 2007 The American Physical Society.Instituto de Física Gleb Wataghin UNICAMP, 13083-970 Campinas, SPLos Alamos National Laboratory, Los Alamos, NM 87545Departamento de Física Universidade Estadual Paulista-Unesp, Caix Postal 473, 17033-360 Bauru, SPDepartment of Physics University of California, Irvine, CA 92697-4575San Diego State University, San Diego, CA 92182Departamento de Física Universidade Estadual Paulista-Unesp, Caix Postal 473, 17033-360 Bauru, SPUniversidade Estadual de Campinas (UNICAMP)Los Alamos National LaboratoryUniversidade Estadual Paulista (UNESP)University of CaliforniaSan Diego State UniversityDuque, J. G.S.Urbano, R. R.Venegas, P. A. [UNESP]Pagliuso, P. G.Rettori, C.Fisk, Z.Oseroff, S. B.2022-04-28T20:21:12Z2022-04-28T20:21:12Z2007-09-26info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.1103/PhysRevB.76.125114Physical Review B - Condensed Matter and Materials Physics, v. 76, n. 12, 2007.1098-01211550-235Xhttp://hdl.handle.net/11449/22496310.1103/PhysRevB.76.1251142-s2.0-34848869087Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengPhysical Review B - Condensed Matter and Materials Physicsinfo:eu-repo/semantics/openAccess2024-04-25T17:40:09Zoai:repositorio.unesp.br:11449/224963Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-04-25T17:40:09Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Exchange and crystal field effects in the ESR spectra of Eu2+ in la B6 |
title |
Exchange and crystal field effects in the ESR spectra of Eu2+ in la B6 |
spellingShingle |
Exchange and crystal field effects in the ESR spectra of Eu2+ in la B6 Duque, J. G.S. |
title_short |
Exchange and crystal field effects in the ESR spectra of Eu2+ in la B6 |
title_full |
Exchange and crystal field effects in the ESR spectra of Eu2+ in la B6 |
title_fullStr |
Exchange and crystal field effects in the ESR spectra of Eu2+ in la B6 |
title_full_unstemmed |
Exchange and crystal field effects in the ESR spectra of Eu2+ in la B6 |
title_sort |
Exchange and crystal field effects in the ESR spectra of Eu2+ in la B6 |
author |
Duque, J. G.S. |
author_facet |
Duque, J. G.S. Urbano, R. R. Venegas, P. A. [UNESP] Pagliuso, P. G. Rettori, C. Fisk, Z. Oseroff, S. B. |
author_role |
author |
author2 |
Urbano, R. R. Venegas, P. A. [UNESP] Pagliuso, P. G. Rettori, C. Fisk, Z. Oseroff, S. B. |
author2_role |
author author author author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual de Campinas (UNICAMP) Los Alamos National Laboratory Universidade Estadual Paulista (UNESP) University of California San Diego State University |
dc.contributor.author.fl_str_mv |
Duque, J. G.S. Urbano, R. R. Venegas, P. A. [UNESP] Pagliuso, P. G. Rettori, C. Fisk, Z. Oseroff, S. B. |
description |
Electron spin resonance of Eu2+ (4 f7, S=7 2) in a La hexaboride (La B6) single crystal shows a single anisotropic Dysonian resonance. From the observed negative g shift of the resonance, it is inferred that the Eu2+ ions are covalent exchange coupled to the B 2p -like host conduction electrons. From the anisotropy of the spectra (linewidth and field for resonance), we found that the S ground state of Eu2+ ions experience a cubic crystal field of a negative fourth order crystal field parameter (CFP), b4 =-11.5 (2.0) Oe, in agreement with the negative fourth order CFP, A4, found for the non- S ground state R hexaborides. These results support covalency as the dominant contribution to the fourth order CFP for the whole R hexaboride family. © 2007 The American Physical Society. |
publishDate |
2007 |
dc.date.none.fl_str_mv |
2007-09-26 2022-04-28T20:21:12Z 2022-04-28T20:21:12Z |
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.76.125114 Physical Review B - Condensed Matter and Materials Physics, v. 76, n. 12, 2007. 1098-0121 1550-235X http://hdl.handle.net/11449/224963 10.1103/PhysRevB.76.125114 2-s2.0-34848869087 |
url |
http://dx.doi.org/10.1103/PhysRevB.76.125114 http://hdl.handle.net/11449/224963 |
identifier_str_mv |
Physical Review B - Condensed Matter and Materials Physics, v. 76, n. 12, 2007. 1098-0121 1550-235X 10.1103/PhysRevB.76.125114 2-s2.0-34848869087 |
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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1799965272587632640 |