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Low Energy K-Dependent Electronic Structure of the Layered Magnetoresistive Oxide La1.2Sr1.8Mn2O7

Published online by Cambridge University Press:  10 February 2011

T. Saitoh ,
D. S. Dessau ,
C.-H. Park ,
Z.-X. Shen ,
P. Villella ,
N. Hamada ,
Y. Moritomo  and
Y. Tokura
T. Saitoh
Affiliation:
Department of Physics, University of Colorado, Boulder, CO 80303–0390
D. S. Dessau
Affiliation:
Department of Physics, University of Colorado, Boulder, CO 80303–0390
C.-H. Park
Affiliation:
Department of Applied Physics, Stanford University, Stanford, CA 94305
Z.-X. Shen
Affiliation:
Department of Applied Physics, Stanford University, Stanford, CA 94305
P. Villella
Affiliation:
Department of Physics, University of Colorado, Boulder, CO 80303–0390
N. Hamada
Affiliation:
Joint Research Center for Atom Technology, Tsukuba 305, JAPAN
Y. Moritomo
Affiliation:
Joint Research Center for Atom Technology, Tsukuba 305, JAPAN
Y. Tokura
Affiliation:
Joint Research Center for Atom Technology, Tsukuba 305, JAPAN Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113, JAPAN
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Abstract

We have studied the fc-dependent electronic structure of the layered colossal magnetoresistive manganite La1.2Sr1.8Mn2O7 using high-resolution angle-resolved photoemission spectroscopy. We found dispersive energy bands as a function of the crystal momentum k near the Fermi level (EF). We have also performed local spin density approximation (LSDA)+U band-structure calculations on the current system. The overall experimental dispersion relation is basically in agreement with the band-structure calculations yet close to EF there is a significant deviation from the predicted dispersions. Instead of clear Fermi-surface (FS) crossings, we observe a depression of the features as the FS is approached as if there is a “pseudo” gap in the excitation spectrum. The pseudogap continuously opens with temperature and does not show further significant opening above Tc, corresponding to the metal-insulator transition. Those unusual aspects of the spectra has been discussed from the viewpoint of the strong electron-lattice coupling model.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 494: Symposium V – Science & Technology of Magnetic Oxides , 1997 , 213
Copyright
Copyright © Materials Research Society 1998

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