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RESEARCH PRODUCT
Vortex–antivortex unbinding in oxygen-deficient YBa2Cu3O7− films
L. MiuDana MiuGerhard JakobH. Adriansubject
SuperconductivityPhysicsCondensed matter physicsTransition temperatureDopingEnergy Engineering and Power TechnologyCondensed Matter PhysicsElectronic Optical and Magnetic MaterialsVortexKosterlitz–Thouless transitionElectrical resistivity and conductivityCuprateElectrical and Electronic EngineeringCritical fielddescription
Abstract In-plane zero-magnetic-field current–voltage ( I – V ) characteristics of oxygen-deficient YBa 2 Cu 3 O 7− δ films (7 − δ ∼6.5, 6.55, and 6.65) were thoroughly investigated. A good agreement with the quasi two-dimensional (2D) vortex–antivortex unbinding scenario was observed, similar to the behaviour of highly anisotropic Bi 2 Sr 2 CaCu 2 O 8+ δ films. The temperature variation of the I – V exponent allows the determination of the Berezinskii–Kosterlitz–Thouless transition temperature T KT at the superconducting Cu–O layer level, and the mean-field critical temperature T c0 . We found that both T KT and T c0 increase with increasing doping, and T c0 remains in the region of the electrical resistivity drop. These results do not support the vortex fluctuation scenario for the superconducting transition in underdoped cuprates.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2007-10-01 | Physica C: Superconductivity and its Applications |