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Science 30 April 1999:
Vol. 284. no. 5415, pp. 777 - 779
DOI: 10.1126/science.284.5415.777
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Reports
Pseudogaps and Extrinsic Losses in Photoemission Experiments on Poorly Conducting Solids
Robert Joynt
A photoelectron emitted from a conducting solid may suffer a
substantial energy change through ohmic losses that can drastically alter the line shape on the millielectron volt scale that is now observable through improved resolution. Almost all of this energy loss
occurs after the electron leaves the solid. These losses are expected
to be important in isotropic materials with relatively low
conductivity, such as certain colossal magnetoresistance manganates, and in very electrically anisotropic materials, such as one-dimensional conductors, and may also affect interpretation of photoemission in
superconductors with high transition temperatures. The electric field
of the photoelectron can penetrate the solid, and extrinsic losses of
this type can mimic pseudogap effects and other peculiar features of
photoemission in cubic manganates, as illustrated for
La0.67Ca0.33MnO3.
Department of Physics, University of Wisconsin-Madison, 1150 University Avenue, Madison, WI 53706, USA.
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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
- Intrinsic Versus Extrinsic Pseudogaps in Photoemission Spectra of Poorly Conducting Solids.
- D. S. Dessau, T. Saitoh;, and R. Joynt; (2000)
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287, 767a-767
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- One-Dimensional Electronic Structure and Suppression of d-Wave Node State in (La1.28Nd0.6Sr0.12)CuO4.
- X. J. Zhou, P. Bogdanov, S. A. Kellar, T. Noda, H. Eisaki, S. Uchida, Z. Hussain, and Z. Shen (1999)
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286, 268-272
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- Fermi Surface Nesting and Nanoscale Fluctuating Charge/Orbital Ordering in Colossal Magnetoresistive Oxides.
- Y.-D. Chuang, A. D. Gromko, D. S. Dessau, T. Kimura, and Y. Tokura (2001)
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