Perturbed angular correlation study of the magnetic phase transitions in the rare-earth cobalt Laves phases RCo₂
The order and other properties of the magnetic phase transitions in the rare-earth (R)-cobalt Laves phases RCo2 have been studied for R=Gd, Tb, Dy, Ho, Er, Sm, Nd, and Pr by measuring the temperature dependence of the magnetic hyperfine interaction of the nuclear probe ^111Cdon the cubic R sites usi...
| Autores: | , , |
|---|---|
| Tipo de recurso: | artículo |
| Fecha de publicación: | 2003 |
| País: | España |
| Institución: | Universidad Complutense de Madrid (UCM) |
| Repositorio: | Docta Complutense |
| Idioma: | inglés |
| OAI Identifier: | oai:docta.ucm.es:20.500.14352/52156 |
| Acceso en línea: | https://hdl.handle.net/20.500.14352/52156 |
| Access Level: | acceso abierto |
| Palabra clave: | 538.9 Itinerant electron metamagnetism Hyperfine field Intermetallic compounds Mossbauer Temperature Order 1st-order ^111Cd Alloys Heavy Física de materiales Física del estado sólido 2211 Física del Estado Sólido |
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Perturbed angular correlation study of the magnetic phase transitions in the rare-earth cobalt Laves phases RCo₂Forker, M.Müller, S.Presa Muñoz De Toro, Patricia Marcela De La538.9Itinerant electron metamagnetismHyperfine fieldIntermetallic compoundsMossbauerTemperatureOrder1st-order^111CdAlloysHeavyFísica de materialesFísica del estado sólido2211 Física del Estado SólidoThe order and other properties of the magnetic phase transitions in the rare-earth (R)-cobalt Laves phases RCo2 have been studied for R=Gd, Tb, Dy, Ho, Er, Sm, Nd, and Pr by measuring the temperature dependence of the magnetic hyperfine interaction of the nuclear probe ^111Cdon the cubic R sites using the perturbed angular correlation technique. Both for heavy and light R constituents the transitions change from second order (Gd, Tb, Sm) to first order (Dy, Ho, Er, Nd, Pr) at order temperatures of 150-200 K. For heavy R constituents, the order deduced from the hyperfine interaction is in agreement with previous investigations. The observation of first order transitions in NdCo₂ and PrCo₂, however, is unexpected. In earlier studies the transitions in these compounds are usually classified as second order transitions. Both in the heavy and the light RCo₂ the discontinuous jump of the hyperfine interaction at the first order transitions increases with decreasing order temperature. This trend implies that the Co magnetization at the transition increases with decreasing T_C which can be related to the temperature dependence of the coefficient of the M^(4) term of the free energy in the Wohlfarth-Rhodes-Shimizu theory of itinerant electron magnetism. All compounds investigated presented a spread of the order temperature of similar to1-2 K which results in a coexistence of the paramagnetic and the magnetically ordered phase near the transition and causes a critical increase of the relative linewidth of the hyperfine frequency diverging as δ ∞ [(1-T/T_(C)]^ε with ε =-1.0(1).American Physical SocietyUniversidad Complutense de Madrid20032003-07-0120032003-07-01journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/52156reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/521562026-06-02T12:44:21Z |
| dc.title.none.fl_str_mv |
Perturbed angular correlation study of the magnetic phase transitions in the rare-earth cobalt Laves phases RCo₂ |
| title |
Perturbed angular correlation study of the magnetic phase transitions in the rare-earth cobalt Laves phases RCo₂ |
| spellingShingle |
Perturbed angular correlation study of the magnetic phase transitions in the rare-earth cobalt Laves phases RCo₂ Forker, M. 538.9 Itinerant electron metamagnetism Hyperfine field Intermetallic compounds Mossbauer Temperature Order 1st-order ^111Cd Alloys Heavy Física de materiales Física del estado sólido 2211 Física del Estado Sólido |
| title_short |
Perturbed angular correlation study of the magnetic phase transitions in the rare-earth cobalt Laves phases RCo₂ |
| title_full |
Perturbed angular correlation study of the magnetic phase transitions in the rare-earth cobalt Laves phases RCo₂ |
| title_fullStr |
Perturbed angular correlation study of the magnetic phase transitions in the rare-earth cobalt Laves phases RCo₂ |
| title_full_unstemmed |
Perturbed angular correlation study of the magnetic phase transitions in the rare-earth cobalt Laves phases RCo₂ |
| title_sort |
Perturbed angular correlation study of the magnetic phase transitions in the rare-earth cobalt Laves phases RCo₂ |
| dc.creator.none.fl_str_mv |
Forker, M. Müller, S. Presa Muñoz De Toro, Patricia Marcela De La |
| author |
Forker, M. |
| author_facet |
Forker, M. Müller, S. Presa Muñoz De Toro, Patricia Marcela De La |
| author_role |
author |
| author2 |
Müller, S. Presa Muñoz De Toro, Patricia Marcela De La |
| author2_role |
author author |
| dc.contributor.none.fl_str_mv |
Universidad Complutense de Madrid |
| dc.subject.none.fl_str_mv |
538.9 Itinerant electron metamagnetism Hyperfine field Intermetallic compounds Mossbauer Temperature Order 1st-order ^111Cd Alloys Heavy Física de materiales Física del estado sólido 2211 Física del Estado Sólido |
| topic |
538.9 Itinerant electron metamagnetism Hyperfine field Intermetallic compounds Mossbauer Temperature Order 1st-order ^111Cd Alloys Heavy Física de materiales Física del estado sólido 2211 Física del Estado Sólido |
| description |
The order and other properties of the magnetic phase transitions in the rare-earth (R)-cobalt Laves phases RCo2 have been studied for R=Gd, Tb, Dy, Ho, Er, Sm, Nd, and Pr by measuring the temperature dependence of the magnetic hyperfine interaction of the nuclear probe ^111Cdon the cubic R sites using the perturbed angular correlation technique. Both for heavy and light R constituents the transitions change from second order (Gd, Tb, Sm) to first order (Dy, Ho, Er, Nd, Pr) at order temperatures of 150-200 K. For heavy R constituents, the order deduced from the hyperfine interaction is in agreement with previous investigations. The observation of first order transitions in NdCo₂ and PrCo₂, however, is unexpected. In earlier studies the transitions in these compounds are usually classified as second order transitions. Both in the heavy and the light RCo₂ the discontinuous jump of the hyperfine interaction at the first order transitions increases with decreasing order temperature. This trend implies that the Co magnetization at the transition increases with decreasing T_C which can be related to the temperature dependence of the coefficient of the M^(4) term of the free energy in the Wohlfarth-Rhodes-Shimizu theory of itinerant electron magnetism. All compounds investigated presented a spread of the order temperature of similar to1-2 K which results in a coexistence of the paramagnetic and the magnetically ordered phase near the transition and causes a critical increase of the relative linewidth of the hyperfine frequency diverging as δ ∞ [(1-T/T_(C)]^ε with ε =-1.0(1). |
| publishDate |
2003 |
| dc.date.none.fl_str_mv |
2003 2003-07-01 2003 2003-07-01 |
| dc.type.none.fl_str_mv |
journal article http://purl.org/coar/resource_type/c_6501 |
| dc.type.openaire.fl_str_mv |
info:eu-repo/semantics/article |
| format |
article |
| dc.identifier.none.fl_str_mv |
https://hdl.handle.net/20.500.14352/52156 |
| url |
https://hdl.handle.net/20.500.14352/52156 |
| dc.language.none.fl_str_mv |
Inglés eng |
| language_invalid_str_mv |
Inglés |
| language |
eng |
| dc.rights.none.fl_str_mv |
open access http://purl.org/coar/access_right/c_abf2 |
| dc.rights.openaire.fl_str_mv |
info:eu-repo/semantics/openAccess |
| rights_invalid_str_mv |
open access http://purl.org/coar/access_right/c_abf2 |
| eu_rights_str_mv |
openAccess |
| dc.format.none.fl_str_mv |
application/pdf |
| dc.publisher.none.fl_str_mv |
American Physical Society |
| publisher.none.fl_str_mv |
American Physical Society |
| dc.source.none.fl_str_mv |
reponame:Docta Complutense instname:Universidad Complutense de Madrid (UCM) |
| instname_str |
Universidad Complutense de Madrid (UCM) |
| reponame_str |
Docta Complutense |
| collection |
Docta Complutense |
| repository.name.fl_str_mv |
|
| repository.mail.fl_str_mv |
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| _version_ |
1869403754125590528 |
| score |
15,301603 |