Spatially-resolved relaxation dynamics of photoinduced quasiparticles in underdoped YBa$sub 2$Cu$sub 3$O$sub {7-delta}$

C. W. Luo; P. T. Shih; Y. -J. Chen; M. H. Chen; K. H. Wu; J. Y. Juang; J. -Y. Lin; T. M. Uen; Y. S. Gou

doi:10.1103/PhysRevB.72.092506

paper

Spatially-resolved relaxation dynamics of photoinduced quasiparticles in underdoped YBa $s u b 2$ Cu $s u b 3$ O $s u b 7 - d e l t a$

arXiv:cond-mat/0508489 · doi:10.1103/PhysRevB.72.092506

Abstract

The spatially-resolved relaxation characteristics of photoinduced quasiparticles (QPs) in CuO $s u b 2$ 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 $s u b p$ . 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.

16 pages, 4 figures. To be published in Physical Review B, Brief Report

Spatially-resolved relaxation dynamics of photoinduced quasiparticles in underdoped YBasub2Cusub3Osub7−delta

Abstract

Spatially-resolved relaxation dynamics of photoinduced quasiparticles in underdoped YBa $s u b 2$ Cu $s u b 3$ O $s u b 7 - d e l t a$