Volume 88, Number 4, November 2009
|Number of page(s)||6|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||02 December 2009|
A phenomenological description of the pressure sensitivity of the Curie temperature in hole-doped manganites
Laboratorio de Bajas Temperaturas, Departamento de Física, FCEyN, Universidad Nacional de Buenos Aires Pabellón I, Ciudad Universitaria, C1428EHA Buenos Aires, Argentina
Corresponding author: firstname.lastname@example.org
Accepted: 26 October 2009
We performed high-pressure experiments in La0.8CaSrxMnO3 (LCSMO)(0x0.2) ceramic samples in order to analyze the validity of the well-known relation between the A-cation mean ionic radius 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 Tc 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.
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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