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Photoemission from single crystals of EuBa2Cu3O7-x cleaved below 20 K: Temperature-dependent oxygen loss.
Authors
AJ Arko
RJ Bartlett
+12 more
JC Campuzano
SW Cheong
SD Conradson
Z Fisk
RS List
AP Paulikas
DE Peterson
CB Pierce
JE Schirber
ND Shinn
JD Thompson
BW Veal
Publication date
1 December 1988
Publisher
eScholarship, University of California
Abstract
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. © 1988 The American Physical Society
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Last time updated on 25/12/2021