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- Title
Anisotropy of Microwave Conductivity in the Superconducting and Normal States of YBa[sub 2]Cu[sub 3]O[sub 7 – ][sub x]: 3D–2D Crossover.
- Authors
Trunin, M. R.; Nefedov, Yu. A.
- Abstract
The imaginary parts of microwave conductivity σ"(T<T[SUBc]) and resistivity ρ(T)=1/ρ(T>T[SUBc]) (σ"[SUBab] and ρ[SUBab] and across (&sigma"[SUBc] and &rho[SUBc] the cuprate ab planes of a Yba[SUB2]Cu[SUB3]O[SUB7-x] crystal with the oxygen doping level x varying from 0.07 to 0.47 were measured in the temperature range 5≤ T ≤ 200 K. In the superconducting state, the σ"[SUBab](T)/σ"[SUBab](0) and σ"[SUBc](T)/σ"(0) curves coincide for an optimally doped (x = 0.07) crystal, but, with an increase in x, the slopes of the σ"[SUBc](T)/σ"(0) curves decrease noticeably at T<T[SUBc]/3, on the background of small changes happening to the σ"[SUBab](T)/σ"[SUBab](0) curves. The two-dimensional (2D) transport along the ab planes in the normal state of Yba[SUB2]Cu[SUB]3O[SUB7-x] is always metallic, but there is a crossover (at x = 0.07) from the Drude to hopping (at x > 0.07) conductivity along the c axis. This is confirmed both by the estimates of the lowest metallic and the highest tunneling conductivities along the c axis and by quantitative comparison of the measured &rho[SUBc](T) curves with the curves calculated in the polaron model of quasiparticle transport along the c axis.
- Subjects
ANISOTROPY; MICROWAVES; QUASIPARTICLES
- Publication
JETP Letters, 2003, Vol 77, Issue 10, p592
- ISSN
0021-3640
- Publication type
Article
- DOI
10.1134/1.1595703