Loss of Superconducting Phase Coherence in YBa2Cu3O7 Films: Vortex-Loop Unbinding and Kosterlitz-Thouless Phenomena
Jürgen Kötzler, Detlef Görlitz, Sven Skwirblies, Axel Wriedt
DOI 10.1103/PhysRevLett.87.127005 · Physical Review Letters
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Abstract
The linear conductance G′+iG′′ parallel to the CuO2 planes of flat d=50–600nm thin films is measured between 30mHz and 800kHz. The decay of the phase-coherent superfluid density signals the proliferation of 3D vortex loops which terminates at T*<Tc, where ωG′′(T*) attains 35(5)nH−1 being independent of d. We ascribe this novel transition to the blowout of loops which reach the film thickness. Above Tc, G(ω) appears to be determined by unbound vortex lines thermally excited in a 2D phase-incoherent superfluid showing features previously being associated with a Kosterlitz-Thouless transition.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 89 | Pressure not reported | onset |
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 80 | Pressure not reported | onset |
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 89 | Pressure not reported | onset |
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 80 | Pressure not reported | onset |
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