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Enhanced charge gap in the bilayer manganite La2-2xSr1+2xMn2O7 near x = 0.4.

作者信息

Kim Myung Whun, Lee H J, Yang B J, Kim K H, Moritomo Y, Yu Jaejun, Noh T W

机构信息

ReCOE & FPRD, Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea.

出版信息

Phys Rev Lett. 2007 May 4;98(18):187201. doi: 10.1103/PhysRevLett.98.187201. Epub 2007 May 1.

DOI:10.1103/PhysRevLett.98.187201
PMID:17501603
Abstract

We have investigated the optical conductivity spectra of La2-2xSr1+2xMn2O7 (0.3</=x</=0.5) systematically and found that for x near 0.4 the charge gap shows enhancement of up to approximately 0.3 eV just above the long-range magnetic ordering temperature. From comparison of this charge gap with other experimental results, we conclude that the peculiar x dependence of the charge gap cannot be understood in terms of the charge and lattice correlations only. We suggest that the unusual enhancement originates from the cooperative coupling between the short-range charge or lattice correlations and the quasi-one-dimensional energy band near the Fermi level.

摘要

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