Photoemission from single crystals of EuBa2Cu3O7-x cleaved below 20 k: Temperature-dependent oxygen loss

R. S. List, A. J. Arko, Z. Fisk, S. W. Cheong, S. D. Conradson, J. D. Thompson, C. B. Pierce, D. E. Peterson, R. J. Bartlett, N. D. Shinn, J. E. Schirber, B. W. Veal, A. P. Paulikas, J. C. Campuzano

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The first low-temperature photoemission spectra from well-oxygenated and characterized, cleaved single crystals of the 1:2:3-type superconductors, specifically EuBa2Cu3O7-x, are presented. In contrast with polycrystalline or higher-temperature single-crystalline studies, a distinct and very stable density of states is found at the Fermi edge below 20 K. As the crystal is warmed even to 80 K the emission is rapidly lost from both the upper and lower portions of the Cu-O hybrids. At room temperature there is a loss of intensity at the Fermi edge with an accompanying change in the Ba 4d core-level line shape and the presence of a charging effect indicative of an insulating surface. These results imply that upon warming from 20 K there is very rapid oxygen loss from the cleaved surface with a resulting loss of superconducting behavior. This suggests that future photoemission experiments, especially those investigating detailed band structure, should be performed at low temperatures.

Original languageEnglish (US)
Pages (from-to)11966-11969
Number of pages4
JournalPhysical Review B
Issue number16
StatePublished - 1988
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics


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