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

G. Garbarino; C. Acha

doi:10.1209/0295-5075/88/46003

All issues

Volume 88 / No 4 (November 2009)

EPL, 88 4 (2009) 46003

Abstract

Issue		EPL Volume 88, Number 4, November 2009


Article Number		46003
Number of page(s)		6
Section		Condensed Matter: Structural, Mechanical and Thermal Properties
DOI		https://doi.org/10.1209/0295-5075/88/46003
Published online		02 December 2009

EPL, 88 (2009) 46003

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

G. Garbarino and C. Acha

Laboratorio de Bajas Temperaturas, Departamento de Física, FCEyN, Universidad Nacional de Buenos Aires Pabellón I, Ciudad Universitaria, C1428EHA Buenos Aires, Argentina

Corresponding author: acha@df.uba.ar

Received: 3 June 2009
Accepted: 26 October 2009

Abstract

We performed high-pressure experiments in La_0.8Ca $_{0.2-x}$ Sr_xMnO₃ (LCSMO)(0 $\leqslant$ x $\leqslant$ 0.2) ceramic samples in order to analyze the validity of the well-known relation between the A-cation mean ionic radius $(\langle r_{A}\rangle )$ and the Curie temperature T_c 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 T_c, 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 T_c can be associated with the product of two terms: the polaronic modified bandwidth and an effective hole doping.

PACS: 62.50.-p – High-pressure effects in solids and liquids / 71.30.+h – Metal-insulator transitions and other electronic transitions / 75.47.Lx – Manganites

© EPLA, 2009

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