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Optical spectral weights and the ferromagnetic transition temperature of CMR manganites: relevance of double-exchange to real materials | | A. Chattopadhyay
; A. J. Millis
; S. Das Sarma
; | | Date: |
21 Aug 1999 | | Subject: | Strongly Correlated Electrons; Materials Science | cond-mat.str-el cond-mat.mtrl-sci | | Abstract: | We present a thorough and quantitative comparison of double-exchange models to experimental data on the colossal magnetoresistance manganese perovskites. Our results settle a controversy by showing that physics beyond double-exchange is important even in La$_{0.7}$Sr$_{0.3}$MnO$_3$, which has been regarded as a conventional double-exchange system. We show that the crucial quantity for comparisons of different calculations to each other and to data is the conduction band kinetic energy $K$, which is insensitive to the details of the band structure and can be experimentally determined from optical conductivity measurements. The seemingly complicated dependence of $T_c$ on the Hund’s coupling $J$ and carrier concentration $n$ is shown to reflect the variation of $K$ with $J$, $n$ and temperature. We present results for the optical conductivity which allow interpretation of experiments and show that a feature previously interpreted in terms of the Hund’s coupling was misidentified. We also correct minor errors in the phase diagram presented in previous work. | | Source: | arXiv, cond-mat/9908305 | | Services: | Forum | Review | PDF | Favorites | |
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