Critical Test for Altshuler-Aronov Theory: Evolution of the Density of States Singularity in Double Perovskite ${\mathrm{Sr}}_{2}{\mathrm{FeMoO}}_{6}$ with Controlled Disorder

Critical Test for Altshuler-Aronov Theory: Evolution of the Density of States Singularity in Double Perovskite ${Sr}_{2} {FeMoO}_{6}$ with Controlled Disorder

M. Kobayashi, K. Tanaka, A. Fujimori, Sugata Ray, and D. D. Sarma

Phys. Rev. Lett. 98, 246401 – Published 15 June 2007

Abstract

With high-resolution photoemission spectroscopy measurements, the density of states (DOS) near the Fermi level ( $E_{F}$ ) of double perovskite ${Sr}_{2} {FeMoO}_{6}$ having different degrees of $Fe / Mo$ antisite disorder has been investigated with varying temperature. The DOS near $E_{F}$ showed a systematic depletion with increasing degree of disorder, and recovered with increasing temperature. Altshuler-Aronov (AA) theory of disordered metals well explains the dependences of the experimental results. Scaling analysis of the spectra provides experimental indication for the functional form of the AA DOS singularity.

Received 12 April 2007

DOI:https://doi.org/10.1103/PhysRevLett.98.246401

Authors & Affiliations

M. Kobayashi¹, K. Tanaka¹, A. Fujimori¹, Sugata Ray^2,3,4, and D. D. Sarma^3,4

¹Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
²Materials and Structures Laboratory, Tokyo Institute of Technology, Midori, Yokohama 226-8503, Japan
³Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India
⁴Centre for Advanced Materials, Indian Association for the Cultivation of Science, Kolkata 700032, India

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Vol. 98, Iss. 24 — 15 June 2007

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Physical Review Letters

Critical Test for Altshuler-Aronov Theory: Evolution of the Density of States Singularity in Double Perovskite Sr2FeMoO6 with Controlled Disorder

M. Kobayashi, K. Tanaka, A. Fujimori, Sugata Ray, and D. D. Sarma

Phys. Rev. Lett. 98, 246401 – Published 15 June 2007

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Critical Test for Altshuler-Aronov Theory: Evolution of the Density of States Singularity in Double Perovskite ${Sr}_{2} {FeMoO}_{6}$ with Controlled Disorder