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Photoinduced absorption from localized intra-gap states

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arxiv cond-mat/0006357 v1 pith:MSP2PVG4 submitted 2000-06-23 cond-mat.supr-con cond-mat.str-el

Photoinduced absorption from localized intra-gap states

V.V. Kabanov , J. Demsar , D. Mihailovic This is my paper
classification cond-mat.supr-con cond-mat.str-el
keywords localizedcarriersdensitystatesabsorptionintra-gapmaterialsmoo3
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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A model is developed for photoinduced absorption from localized states observed in femtosecond pump-probe experiments in high-Tc superconductors and other materials. The dynamics of localized carriers are described in terms of phenomenological approach similar to that originaly proposed by Rothwarf and Taylor. Expanding the relaxation rate in powers of the order parameter we have shown that density of localized carriers is sensitive to Tc. From the analysis of the experimental data on YBa2Cu3O(7-x) and K0.3MoO3 we conclude that significant intra-gap density of localized states exists in these materials. Temperature dependence of the density of photoexcited localized carriers in underdoped YBa2Cu3O(7-x) and in K0.3MoO3 is consistent with the observation of the pseudogap above Tc.

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