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Published Online April 26, 2001
Science DOI: 10.1126/science.1059255

Research Articles

Submitted on January 23, 2001
Accepted on April 10, 2001

Fermi Surface Nesting and Nanoscale Fluctuating Charge/Orbital Ordering in Colossal Magnetoresistive Oxides

Y.-D. Chuang 1, A. D. Gromko 2, D. S. Dessau 2, T. Kimura 3, Y. Tokura 3

1 Department of Physics, University of Colorado, Boulder, CO, 80309-0390, USA; Advanced Light Source, LBNL, Berkeley, CA 94720, USA.
2 Department of Physics, University of Colorado, Boulder, CO, 80309-0390, USA.
3 Department of Applied Physics, University of Tokyo, Tokyo 113, Japan.

We have used high resolution angle-resolved photoemission spectroscopy to reveal the Fermi Surface and key transport parameters of the metallic state of the layered colossal magnetoresistive oxide La1.2Sr1.8Mn2O7. Using these parameters the calculated in-plane conductivity is nearly one order of magnitude larger than the measured DC conductivity. This discrepancy can be accounted for by including the pseudogap which removes at least 90% of the spectral weight at the Fermi energy. Key to the pseudogap and many other properties are the parallel straight Fermi surface sections which are highly susceptible to nesting instabilities. These nesting instabilities produce nanoscale fluctuating charge/orbital modulations which cooperate with Jahn-Teller distortions and compete with the electron itinerancy favored by double exchange.


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Science. ISSN 0036-8075 (print), 1095-9203 (online)