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

  • Author(s): List, RS;
  • Arko, AJ;
  • Fisk, Z;
  • Cheong, SW;
  • Conradson, SD;
  • Thompson, JD;
  • Pierce, CB;
  • Peterson, DE;
  • Bartlett, RJ;
  • Shinn, ND;
  • Schirber, JE;
  • Veal, BW;
  • Paulikas, AP;
  • Campuzano, JC
  • et al.
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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