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Abstract:

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.

Registro:

Documento: Artículo
Título:A phenomenological description of the pressure sensitivity of the Curie temperature in hole-doped manganites
Autor:Garbarino, G.; Acha, C.
Filiación:Laboratorio de Bajas Temperaturas, Departamento de Física, FCEyN, Universidad Nacional de Buenos Aires Pabellón I, Ciudad Universitaria, C1428EHA Buenos Aires, Argentina
ID27-ESRF, BP 166, Cedex 09, 38042 Grenoble, France
Año:2009
Volumen:88
Número:4
DOI: http://dx.doi.org/10.1209/0295-5075/88/46003
Título revista:Europhysics Letters
Título revista abreviado:Europhys. Lett.
ISSN:02955075
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02955075_v88_n4_p_Garbarino

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Citas:

---------- APA ----------
Garbarino, G. & Acha, C. (2009) . A phenomenological description of the pressure sensitivity of the Curie temperature in hole-doped manganites. Europhysics Letters, 88(4).
http://dx.doi.org/10.1209/0295-5075/88/46003
---------- CHICAGO ----------
Garbarino, G., Acha, C. "A phenomenological description of the pressure sensitivity of the Curie temperature in hole-doped manganites" . Europhysics Letters 88, no. 4 (2009).
http://dx.doi.org/10.1209/0295-5075/88/46003
---------- MLA ----------
Garbarino, G., Acha, C. "A phenomenological description of the pressure sensitivity of the Curie temperature in hole-doped manganites" . Europhysics Letters, vol. 88, no. 4, 2009.
http://dx.doi.org/10.1209/0295-5075/88/46003
---------- VANCOUVER ----------
Garbarino, G., Acha, C. A phenomenological description of the pressure sensitivity of the Curie temperature in hole-doped manganites. Europhys. Lett. 2009;88(4).
http://dx.doi.org/10.1209/0295-5075/88/46003