Anisotropy of microwave conductivity of YBaCuO in superconducting and normal states: Crossover 3D-2D

Details Anisotropy of microwave conductivity of YBaCuO in superconducting and normal states: Crossover 3D-2D Anisotropy of microwave conductivity of YBaCuO in superconducting and normal states: Crossover 3D-2D

2003-06-06

arxiv.org/abs/cond-mat/0306158v1

Pis'ma v ZhETF, 77(10), 696 (2003)

Physics

Condensed Matter

Superconductivity

5 pages, 4 figures

Scientific paper

Imaginary part of the microwave conductivity \sigma''(TT_c) along (\sigma_{ab}'' and \rho_{ab}) and perpendicular to (\sigma_c'' and \rho_c) cuprate ab-planes of YBa_2Cu_3O_{7-x} crystal were measured in the temperature range 5\leq T \leq 200 K, having varied the oxygen doping level x in the crystal from 0.07 to 0.47. The superconducting state was found to have the dependences \sigma_{ab}''(T)/\sigma_{ab}''(0) and \sigma_c''(T)/\sigma_c''(0) coincide in the optimally doped (x=0.07) crystal. With the increase of x the dependences \sigma_c''(T)/\sigma_c''(0) have smaller slope at T0.07) takes place. This is proved by both estimating minimum metallic c-conductivity and maximum tunneling c-conductivity and quantitatively comparing the measured dependences \rho_c(T) with the ones calculated in the polaron model of quasiparticles' c-transport.

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