Physics – Condensed Matter – Superconductivity
Scientific paper
2005-05-11
Phys. Rev. B 73, 014508 (2006).
Physics
Condensed Matter
Superconductivity
13 pages 16 figures
Scientific paper
10.1103/PhysRevB.73.014508
The a-axis optical properties of a detwinned single crystal of YBa_2Cu_3O_6.50 in the ortho II phase (Ortho II Y123, T_c= 59 K) were determined from reflectance data over a wide frequency range (70 - 42 000 cm^-1) for nine temperature values between 28 and 295 K. Above 200 K the spectra are dominated by a broad background of scattering that extends to 1 eV. Below 200 K a shoulder in the reflectance appears and signals the onset of scattering at 400 cm^-1. In this temperature range we also observe a peak in the optical conductivity at 177 cm^-1. Below 59 K, the superconducting transition temperature, the spectra change dramatically with the appearance of the superconducting condensate. Its spectral weight is consistent, to within experimental error, with the Ferrell-Glover-Tinkham (FGT) sum rule. We also compare our data with magnetic neutron scattering on samples from the same source that show a strong resonance at 31 meV. We find that the scattering rates can be modeled as the combined effect of the neutron resonance and a bosonic background in the presence of a density of states with a pseudogap. The model shows that the decreasing amplitude of the neutron resonance with temperature is compensated for by an increasing of the bosonic background yielding a net temperature independent scattering rate at high frequencies. This is in agreement with the experiments.
Bonn Douglas A.
Carbotte Jules P.
Hardy Walter N.
Hwang Jungseek
Liang Ruixing
No associations
LandOfFree
The a-axis optical conductivity of detwinned ortho-II YBa_2Cu_3O_6.50 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The a-axis optical conductivity of detwinned ortho-II YBa_2Cu_3O_6.50, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The a-axis optical conductivity of detwinned ortho-II YBa_2Cu_3O_6.50 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-73265