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

Details A phenomenological model for the pressure sensitivity of the Curie temperature in hole-doped manganites A phenomenological model for the pressure sensitivity of the Curie temperature in hole-doped manganites

2009-05-22

arxiv.org/abs/0905.3767v1

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 7 figures, corresponding author: C. Acha (acha@df.uba.ar)

Scientific paper

We performed high pressure experiments on La(0.8)Ca(0.2-x)Sr(x)MnO(3) (LCSMO) (0) 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 law that considers the systematic dependence of Tc with structural and electronic parameters. This law 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.

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