Theory of the Resistive Transition in Overdoped Tl2Ba2CuO6+δ: Implications for the Vortex Viscosity and the Quasiparticle Scattering Rate in High- Tc Superconductors
V. B. Geshkenbein, L. B. Ioffe, A. J. Millis
DOI 10.1103/PhysRevLett.80.5778 · Physical Review Letters
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Abstract
We show that recent measurements of the magnetic field dependence of the magnetization, specific heat and resistivity of overdoped Tc∼17K Tl2Ba2CuO6+δ in the vicinity of the superconducting Hc2 imply that the vortex viscosity is anomalously small and that the material studied is inhomogeneous with small (a few hundred angstroms), regions in which the local Tc is much higher than the bulk Tc. The anomalously small vortex viscosity can be derived from a microscopic model in which the quasiparticle lifetime varies dramatically around the Fermi surface, being small everywhere except along the zone diagonal (“cold spot”). We propose experimental tests of our results.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Tl2Ba2CuO6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 17 | Pressure not reported | unknown |
| Tl2Ba2CuO6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 17 | Pressure not reported | unknown |
| Tl2Ba2CuO6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 17 | Pressure not reported | unknown |
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