Photoemission from single-crystal EuBa/sub 2/Cu/sub 3/O/sub 6+x/ cleaved below 20K: Metallic-to-insulating surface transformation

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Valence band ultraviolet photoemission spectra (UPS) of single-crystal EuBa/sub 2/Cu/sub 3/O/sub 6+x/ (x > 0.6) samples cleaved in vacuum at 20 K demonstrate that the metallic superconducting phase undergoes an irreversible transformation via near-surface oxygen loss to an insulating state upon annealing above 50 K. Freshly cleaved surfaces at 20 K exhibit a density of states at the Fermi level comparable to that of copper, and have both O(2p) and Cu(3d) character at E/sub F/ based on the photon energy dependence of the intensity. Reasonably good agreement between band structure calculations and the present data would suggest theoretical models using ... continued below

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7 pages

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List, R.S.; Arko, A.J.; Fisk, Z.; Cheong, S.W.; Conradson, S.D.; Thompson, J.D. et al. January 1, 1988.

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Valence band ultraviolet photoemission spectra (UPS) of single-crystal EuBa/sub 2/Cu/sub 3/O/sub 6+x/ (x > 0.6) samples cleaved in vacuum at 20 K demonstrate that the metallic superconducting phase undergoes an irreversible transformation via near-surface oxygen loss to an insulating state upon annealing above 50 K. Freshly cleaved surfaces at 20 K exhibit a density of states at the Fermi level comparable to that of copper, and have both O(2p) and Cu(3d) character at E/sub F/ based on the photon energy dependence of the intensity. Reasonably good agreement between band structure calculations and the present data would suggest theoretical models using the band state as a starting point. 18 refs., 2 figs.

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7 pages

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NTIS, PC A02/MF A01 - OSTI; 1.

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  • Topical conference on high-/Tc/ superconducting thin films, devices, and characterization, Atlanta, GA, USA, 3 Oct 1988

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  • Other: DE89002237
  • Report No.: LA-UR-88-3413
  • Report No.: CONF-881035-2
  • Grant Number: W-7405-ENG-36
  • Grant Number: AC02-76CH00016
  • Grant Number: AC04-76DP00789
  • Grant Number: W-7405-ENG-82
  • Office of Scientific & Technical Information Report Number: 6627826
  • Archival Resource Key: ark:/67531/metadc1185521

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  • January 1, 1988

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  • July 3, 2018, 8:14 a.m.

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  • May 3, 2019, 7:02 p.m.

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List, R.S.; Arko, A.J.; Fisk, Z.; Cheong, S.W.; Conradson, S.D.; Thompson, J.D. et al. Photoemission from single-crystal EuBa/sub 2/Cu/sub 3/O/sub 6+x/ cleaved below 20K: Metallic-to-insulating surface transformation, article, January 1, 1988; United States. (https://digital.library.unt.edu/ark:/67531/metadc1185521/: accessed August 26, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.