Marginal Fermi liquid analysis of 300 K reflectance of Bi2Sr2CaCu2O8+x

Details Marginal Fermi liquid analysis of 300 K reflectance of Bi2Sr2CaCu2O8+x Marginal Fermi liquid analysis of 300 K reflectance of Bi2Sr2CaCu2O8+x

2003-06-10

arxiv.org/abs/cond-mat/0306250v2

Physical review B 69, 094520 (2004)

Physics

Condensed Matter

Superconductivity

11 pages, 11 figures

Scientific paper

10.1103/PhysRevB.69.094520

We use 300 K reflectance data to investigate the normal-state electrodynamics of the high temperature superconductor Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8+\delta}$ over a wide range of doping levels. The data show that at this temperature the free carriers are coupled to a continuous spectrum of fluctuations. Assuming the Marginal Fermi Liquid (MFL) form as a first approximation for the fluctuation spectrum, the doping-dependent coupling constant $\lambda (p)$ can be estimated directly from the slope of the reflectance spectrum. We find that $\lambda (p)$ decreases smoothly with the hole doping level, from underdoped samples with $ p=0.103$ ($T_c = 67$ K) where $\lambda (p)= 0.93$ to overdoped samples with $p=0.226$, ($T_c= 60$ K) where $\lambda(p)= 0.53$. An analysis of the intercept and curvature of the reflectance spectrum shows deviations from the MFL spectrum symmetrically placed at the optimal doping point $p=0.16$. The Kubo formula for the conductivity gives a better fit to the experiments with the MFL spectrum up to 2000 cm$^{-1}$ and with an additional Drude component or an additional Lorentz component up to 7000 cm$^{-1}$. By comparing three different model fits we conclude that the MFL channel is necessary for a good fit to the reflectance data. Finally, we note that the monotonic variation of the reflectance slope with doping provides us with an independent measure of the doping level for the Bi-2212 system.

Affiliated with

Also associated with

No associations

Rating

Marginal Fermi liquid analysis of 300 K reflectance of Bi2Sr2CaCu2O8+x 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 Marginal Fermi liquid analysis of 300 K reflectance of Bi2Sr2CaCu2O8+x, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Marginal Fermi liquid analysis of 300 K reflectance of Bi2Sr2CaCu2O8+x will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-367727