Persistent photo-excitation in GdBa2Cu3O6.5 in a simultaneous Raman and electrical-transport experiment

S. Bahrs, J. Guimpel, A. R. Goñi, B. Maiorov, A. Fainstein, G. Nieva, and C. Thomsen
Phys. Rev. B 72, 144501 – Published 3 October 2005

Abstract

We investigate the connection between persistent illumination-induced effects in underdoped RBa2Cu3O7δ known as persistent photoconductivity and Raman bleaching. Despite the long-standing assumption that the electrical and optical properties respond to the same light-induced change in the material, they have not been directly compared until now. We present a simultaneous experiment of Raman spectroscopy and electrical transport under visible illumination at low temperatures. The time dependence of the response in the two methods differs by two orders of magnitude, showing that the effects are connected but not identical. We discuss our results within the oxygen-vacancy reordering model of photobleaching and find that different Cu-O chain lengths affect the optical and the electrical response differently. Raman bleaching and persistent photoconductivity thus provide a different perspective on the microscopic oxygen vacancy distribution.

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  • Received 28 April 2005

DOI:https://doi.org/10.1103/PhysRevB.72.144501

©2005 American Physical Society

Authors & Affiliations

S. Bahrs1, J. Guimpel2, A. R. Goñi3, B. Maiorov4, A. Fainstein2, G. Nieva2, and C. Thomsen1

  • 1Institut für Festkörperphysik, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin, Germany
  • 2Centro Atómico Bariloche, Comisión Nacional de Energía Atómica, 8400 San Carlos de Bariloche, Río Negro, Argentina
  • 3ICREA Research Professor, Institut de Ciència de Materials de Barcelona, Campus de la UAB, 08193 Bellaterra, Spain
  • 4Superconductivity Technology Center, MS K763, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

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Issue

Vol. 72, Iss. 14 — 1 October 2005

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