Light-induced oxygen-ordering dynamics in (Y,Pr)Ba2Cu3O6.7: A Raman spectroscopy and Monte Carlo study

S. Bahrs, A. R. Goñi, C. Thomsen, B. Maiorov, G. Nieva, and A. Fainstein
Phys. Rev. B 70, 014512 – Published 26 July 2004

Abstract

We investigated the time and temperature dependence of photobleaching effects in RBa2Cu3O7δ single crystals (R=Y,Pr) by Raman spectroscopy and Monte Carlo simulations based on the asymmetric next-nearest-neighbor Ising model. In a temperature range between 40 and 300K the bleaching slows down on cooling, displaying a pronounced change in dynamics around 160K for R=Y. To model this behavior we extended the Ising model by introducing a single energy barrier which impedes oxygen movement in the plane unless the oxygen atoms are excited by light. We obtain a time- and temperature-dependent development of superstructures under illumination with the fastest change at intermediate model temperatures. The chain-fragment development in the simulation thus matches the experimental low-temperature dynamics of Raman photobleaching, providing further support for oxygen reordering in the chain plane being at the origin of Raman photobleaching and related effects.

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  • Received 14 November 2003

DOI:https://doi.org/10.1103/PhysRevB.70.014512

©2004 American Physical Society

Authors & Affiliations

S. Bahrs, A. R. Goñi*, and C. Thomsen

  • Institut für Festkörperphysik, Technische Universität Berlin, Hardenbergstraße 36, 10623 Berlin, Germany

B. Maiorov

  • Superconductivity Technology Center, MS K763, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

G. Nieva and A. Fainstein

  • Centro Atómico Bariloche, Comisión Nacional de Energía Atómica, 8400 San Carlos de Bariloche, Río Negro, Argentina

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

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Vol. 70, Iss. 1 — 1 July 2004

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