A phenomenological description of the pressure sensitivity of the Curie temperature in hole-doped manganites

We performed high-pressure experiments in La0.8Ca0.2-xSr xMnO3 (LCSMO)(0≤ x ≤ 0.2) ceramic samples in order to analyze the validity of the well-known relation between the A-cation mean ionic radius ((ra)) and the Curie temperature Tc of hole-doped manganites at a fixed doping level and for doping va...

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Autores principales: Garbarino, Gastón Leonel, Acha, Carlos Enrique
Publicado: 2009
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02955075_v88_n4_p_Garbarino
http://hdl.handle.net/20.500.12110/paper_02955075_v88_n4_p_Garbarino
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling paper:paper_02955075_v88_n4_p_Garbarino2023-06-08T15:27:11Z A phenomenological description of the pressure sensitivity of the Curie temperature in hole-doped manganites Garbarino, Gastón Leonel Acha, Carlos Enrique We performed high-pressure experiments in La0.8Ca0.2-xSr xMnO3 (LCSMO)(0≤ x ≤ 0.2) ceramic samples in order to analyze the validity of the well-known relation between the A-cation mean ionic radius ((ra)) and the Curie temperature Tc of hole-doped manganites at a fixed doping level and for doping values below the 0.3 (Mn+4/Mn+3) ratio. By considering our results and collecting others from the literature, we were able to propose a phenomenological relation that considers the systematic dependence of T c with structural and electronic parameters. The proposed expression predicts fairly well the pressure sensitivity of Tc, its dependence with the A-cation radius disorder and its evolution in the high-pressure range. Considering a Double-Exchange model, modified by polaronic effects, the phenomenological law obtained for Tc can be associated with the product of two terms: the polaronic modified bandwidth and an effective hole doping. Copyright © EPLA, 2009. Fil:Garbarino, G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Acha, C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2009 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02955075_v88_n4_p_Garbarino http://hdl.handle.net/20.500.12110/paper_02955075_v88_n4_p_Garbarino
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description We performed high-pressure experiments in La0.8Ca0.2-xSr xMnO3 (LCSMO)(0≤ x ≤ 0.2) ceramic samples in order to analyze the validity of the well-known relation between the A-cation mean ionic radius ((ra)) and the Curie temperature Tc of hole-doped manganites at a fixed doping level and for doping values below the 0.3 (Mn+4/Mn+3) ratio. By considering our results and collecting others from the literature, we were able to propose a phenomenological relation that considers the systematic dependence of T c with structural and electronic parameters. The proposed expression predicts fairly well the pressure sensitivity of Tc, its dependence with the A-cation radius disorder and its evolution in the high-pressure range. Considering a Double-Exchange model, modified by polaronic effects, the phenomenological law obtained for Tc can be associated with the product of two terms: the polaronic modified bandwidth and an effective hole doping. Copyright © EPLA, 2009.
author Garbarino, Gastón Leonel
Acha, Carlos Enrique
spellingShingle Garbarino, Gastón Leonel
Acha, Carlos Enrique
A phenomenological description of the pressure sensitivity of the Curie temperature in hole-doped manganites
author_facet Garbarino, Gastón Leonel
Acha, Carlos Enrique
author_sort Garbarino, Gastón Leonel
title A phenomenological description of the pressure sensitivity of the Curie temperature in hole-doped manganites
title_short A phenomenological description of the pressure sensitivity of the Curie temperature in hole-doped manganites
title_full A phenomenological description of the pressure sensitivity of the Curie temperature in hole-doped manganites
title_fullStr A phenomenological description of the pressure sensitivity of the Curie temperature in hole-doped manganites
title_full_unstemmed A phenomenological description of the pressure sensitivity of the Curie temperature in hole-doped manganites
title_sort phenomenological description of the pressure sensitivity of the curie temperature in hole-doped manganites
publishDate 2009
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02955075_v88_n4_p_Garbarino
http://hdl.handle.net/20.500.12110/paper_02955075_v88_n4_p_Garbarino
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AT achacarlosenrique aphenomenologicaldescriptionofthepressuresensitivityofthecurietemperatureinholedopedmanganites
AT garbarinogastonleonel phenomenologicaldescriptionofthepressuresensitivityofthecurietemperatureinholedopedmanganites
AT achacarlosenrique phenomenologicaldescriptionofthepressuresensitivityofthecurietemperatureinholedopedmanganites
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