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Originally published in Science Express on 26 April 2001
Science 25 May 2001:
Vol. 292. no. 5521, pp. 1509 - 1513
DOI: 10.1126/science.1059255
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Research Articles

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

Y.-D. Chuang,12 A. D. Gromko,1 D. S. Dessau,1 T. Kimura,3 Y. Tokura34

We 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. With these parameters, the calculated in-plane conductivity is nearly one order of magnitude larger than the measured direct current 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 to 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.

1 Department of Physics, University of Colorado, Boulder, CO 80309-0390, USA.
2 Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
3 Department of Applied Physics, University of Tokyo, Tokyo 113, Japan.
4 Joint Research Center for Atom Technology, Tsukuba 305-0046, Japan.

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