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Spatially-resolved relaxation dynamics of photoinduced quasiparticles in underdoped YBasub 2Cusub 3Osub {7-delta}

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arxiv cond-mat/0508489 v1 pith:DL3W5C5Z submitted 2005-08-20 cond-mat.supr-con cond-mat.str-el

Spatially-resolved relaxation dynamics of photoinduced quasiparticles in underdoped YBasub 2Cusub 3Osub {7-delta}

C. W. Luo , P. T. Shih , Y.-J. Chen , M. H. Chen , K. H. Wu , J. Y. Juang , J.-Y. Lin , T. M. Uen
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Y. S. Gou
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classification cond-mat.supr-con cond-mat.str-el
keywords alongdeltarelaxationunderdopedaxisdynamicsphotoinducedquasiparticles
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The spatially-resolved relaxation characteristics of photoinduced quasiparticles (QPs) in CuO$sub 2$ planes of underdoped YBCO are disclosed by polarized fs time-resolved spectroscopy. The relaxation time (tau) along b axis diverges at Tc, and appears to be governed by a temperature-dependent gap Delta(T) at T < Tc. Furthermore, for T > Tc, a monotonic increase of tau with decreasing T along the b axis and ab diagonal was observed and can be attributed to a temperature-independent gap Delta$sub p$. The results lend support to recombination dominant scenario of QP dynamics. However, the QP thermalization may take part along the nodal direction in the highly underdoped samples.

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