Quasiparticle relaxation dynamics in superconductors with different gap structures: Theory and experiments on YBa2Cu3O7−δ
V. V. Kabanov, J. Demsar, B. Podobnik, D. Mihailovic
DOI 10.1103/PhysRevB.59.1497 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
Photoexcited quasiparticle relaxation dynamics are investigated in a YBa2Cu3O7−δ superconductor as a function of doping δ and temperature T using ultrafast time-resolved optical spectroscopy. A model calculation is presented that describes the temperature dependence of the photoinduced quasiparticle population npe, photoinduced transmission ΔT/T, and relaxation time τ for three different superconducting gaps: (i) a temperature-dependent collective gap such that Δ(T)→0 as T→Tc, (ii) a temperature-independent gap, which might arise for the case of a superconductor with preformed pairs, and (iii) an anisotropic (e.g., d-wave) gap with nodes. Comparison of the theory with data of photoinduced transmission |ΔT/T|, reflection |ΔR/R|, and quasiparticle recombination time τ in YBa2Cu3O7−δ over a very wide range of doping (0.1<δ<0.48) is found to give good quantitative agreement with a temperature-dependent BCS-like isotropic gap near optimum doping (δ<0.1) and a temperature-independent isotropic gap in underdoped YBa2Cu3O7−δ(0.15<δ<0.48). A pure d-wave gap was found to be inconsistent with the data.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 89 | Pressure not reported | unknown |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 53 | Pressure not reported | unknown |
Similar papers
Doping dependence of the gap anisotropy of the high-temperature YBa2Cu3O7−δ superconductor
similarity 0.96K. Nakayama et al.
Source status unknown — claims are unverified
Spatial dichotomy of quasiparticle dynamics in underdoped thin-film YBa2Cu3O7−δ superconductors
similarity 0.96C. W. Luo et al.
Source status unknown — claims are unverified
Comparison of small-field behavior in MgB2, Low- and high-temperature superconductors
similarity 0.96Alexey V. Pan & Shi X. Dou
Source status unknown — claims are unverified
Origin of the plateau in the temperature dependence of the normalized magnetization relaxation rate in disordered high-temperature superconductors
similarity 0.96L. Miu et al.
Source status unknown — claims are unverified
Depression and broadening of the superconducting transition in superlattices based on YBa2Cu3O7−δ: Influence of the barrier layers
similarity 0.96David P. Norton et al.
Source status unknown — claims are unverified
Time-Resolved Optical Studies of Quasiparticle Dynamics in High-Temperature Superconductors: Experiments and theory
similarity 0.96D. Mihailovic & J. Demsar · 1999 · arXiv:cond-mat/9902243
Source status unknown — claims are unverified