Optical properties along the c axis of YBa_2Cu_3O_{6+x}, for x=0.50 -> 0.95: evolution of the pseudogap

Details Optical properties along the c axis of YBa_2Cu_3O_{6+x}, for x=0.50 -> 0.95: evolution of the pseudogap Optical properties along the c axis of YBa_2Cu_3O_{6+x}, for x=0.50 -> 0.95: evolution of the pseudogap

1995-09-20

arxiv.org/abs/cond-mat/9509128v1

Physica C 254, 265-280 (1995); Erratum - Physica C 432, 316 (2005)

Physics

Condensed Matter

14 pages with 11 embedded figures, Z-compressed postscript, accepted for publication in Physica C

Scientific paper

10.1016/0921-4534(95)00579-X, 10

The reflectance of high-quality, unpolished single crystals of YBa_2Cu_3O_{6+x}, for the doping range x=0.50 -> 0.95, has been measured with radiation polarized along the c axis from approx 50 cm^{-1} to 5000 cm^{-1} between 10 K and 300 K. In highly doped (x=0.95) material, the normal-state conductivity shows a metallic response. For intermediate dopings (x=0.85 -> 0.90) the conductivity is no longer metallic, increasing with temperature, and for low dopings (x=0.50 -> 0.80) this behavior is clearly seen to be caused by a pseudogap at approx 280 cm^{-1}, which develops well above T_c. In the superconducting state, in the optimally-doped material, a gap-like depression develops below T_c but there is residual conductivity to very low frequency indicating either an anisotropic gap, or a gap with nodes. In the underdoped materials the superconductivity-induced changes to the conductivity are harder to see, but it appears that the weight of the condensate originates at frequencies much higher than the conventional weak-coupling value of 3.5k_BT_c.

Affiliated with

Also associated with

No associations

Rating

Optical properties along the c axis of YBa_2Cu_3O_{6+x}, for x=0.50 -> 0.95: evolution of the pseudogap 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 Optical properties along the c axis of YBa_2Cu_3O_{6+x}, for x=0.50 -> 0.95: evolution of the pseudogap, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical properties along the c axis of YBa_2Cu_3O_{6+x}, for x=0.50 -> 0.95: evolution of the pseudogap will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-613401