Photoinduced chain-oxygen ordering in detwinned YBa2Cu3O6.7 single crystals studied by reflectance-anisotropy spectroscopy

A. Bruchhausen, S. Bahrs, K. Fleischer, A. R. Goñi, A. Fainstein, G. Nieva, A. A. Aligia, W. Richter, and C. Thomsen
Phys. Rev. B 69, 224508 – Published 21 June 2004

Abstract

We present a reflectance-anisotropy spectroscopy (RAS) investigation of photoexcitation and annealing effects in oxygen deficient detwinned YBa2Cu3O6.7 single crystals. Well-resolved RAS spectral features are either bleached or enhanced on a time scale of hours upon laser illumination with polarization parallel to the Cu(1)O(1) chains. These photoinduced effects recover with room temperature annealing in the dark. Based on previous ellipsometric studies and on cluster models for the oxygen CuO(1) chain-fragments we are able to assign the RAS peaks that depend on illumination to optical transitions involving copper atoms located either on short chain-fragments or in isolated CuO(4)2 sites. This provides strong evidence that photoinduced chain-oxygen ordering is indeed at the origin of persistent photoconductivity and Raman vibrational mode bleaching in these materials.

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  • Received 5 February 2004

DOI:https://doi.org/10.1103/PhysRevB.69.224508

©2004 American Physical Society

Authors & Affiliations

A. Bruchhausen1, S. Bahrs2, K. Fleischer2, A. R. Goñi2,*, A. Fainstein1,†, G. Nieva1,†, A. A. Aligia1,†, W. Richter2, and C. Thomsen2

  • 1Centro Atómico Bariloche and Instituto Balseiro, C.N.E.A., 8400 Bariloche, R. N., Argentina
  • 2Institut für Festkörperphysik, Technische Universität Berlin, Hardenbergstrasse 36, 10623 Berlin, Germany

  • *Permanent address: ICREA Research Professor, Institut de Ciència de Materials de Barcelona, Campus de la UAB, 08193 Bellaterra, Spain.
  • Also at CONICET.

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Issue

Vol. 69, Iss. 22 — 1 June 2004

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