The European Physical Journal B

ISSN: 1434-6028 (printed version)
ISSN: 1434-6036 (electronic version)

Table of Contents

Abstract Volume 5 Issue 3 (1998) pp 413-417

Orbital degrees of freedom and electron correlation in optical absorption of metallic La$\mathsf{_{1-x}}$Sr$\mathsf{_x}$MnO$\mathsf{_3}$

A. Takahashi, H. Shiba (a)

Department of Physics, Tokyo Institute of Technology, Oh-okayama, Tokyo 152, Japan

Received: 13 February 1998 / Accepted: 17 March 1998

Abstract: The optical absorption in ferromagnetic metal La_1-xSr_xMnO₃ is anomalous; it has a wide-range absorption up to about 1 eV even at zero temperature. Since 3d electrons in La_1-xSr_xMnO₃ partially fill doubly degenerate e_g orbitals, the orbital degrees of freedom are crucial to understand this metallic system. We argue that the interband transition within e_g orbitals is important in the optical absorption. The optical spectrum is modified also by the inter-orbital Coulomb interaction. We have examined perturbatively the effect of the Coulomb interaction on the spectrum. Available experiments are discussed by comparing with the present results.

PACS. 71.27.+a Strongly correlated electron systems; heavy fermions - 71.30.+h Metal insulator transitions and other electronic transitions - 78.20.-e Optical properties of bulk materials and thin films

(a) email: shiba@stat.phys.titech.ac.jp

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Online publication: October 26, 1998
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