Spatial dichotomy of quasiparticle dynamics in underdoped thin-film YBa2 Cu3 O7-δ superconductors

Chih-Wei Luo*, C. C. Hsieh, Y. J. Chen, P. T. Shih, M. H. Chen, Kaung-Hsiung Wu, Jenh-Yih Juang, Jiunn-Yuan Lin, T. M. Uen, Y. S. Gou

*Corresponding author for this work

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By the spatial-temporal-resolved femtosecond spectroscopy on well-textured (110)- and (100)-YBCO thin films, two distinctly temperature-dependent characteristics of quasiparticle relaxation in the nodal and antinodal directions are clearly identified. One temperature dependence associated with a high-energy gap has been observed along the ab diagonal for the whole hole-doping region and along the b axis except near optimal doping, while the other temperature dependence related to the opening of the superconducting gap appears along b axis regardless of the hole concentration. This spatial dichotomy between the nodal and antinodal quasiparticle dynamics and the evolution of gap symmetry with hole doping are discussed for enlightenment on the nature of the phase diagram of hole-doped cuprates. These strongly suggest that the two characteristics may have different physical origins and compete with each other.

Original languageEnglish
Article number184525
Number of pages5
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number18
StatePublished - 22 Nov 2006


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