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Author  |
Bahrs, S.; Goni, A.R.; Thomsen, C.; Maiorov, B.; Nieva, G.; Fainstein, A. |
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Title |
Light-induced oxygen-ordering dynamics in (Y,Pr)Ba2Cu3O6.7: A Raman spectroscopy and Monte Carlo study |
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Journal Article |
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Year |
2004 |
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PHYSICAL REVIEW B |
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70 |
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1 |
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014512 |
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Abstract |
We investigated the time and temperature dependence of photobleaching effects in RBa2Cu3O7-delta 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 300 K the bleaching slows down on cooling, displaying a pronounced change in dynamics around 160 K 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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1098-0121 |
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ISI:000222996300096 |
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Call Number |
BT @ hernan @ |
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207 |
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