Flux-flow resistance in the cuprate superconductor Nd2−xCexCuOy: Spatial domains and spontaneous oscillations
A. Wehner, O. M. Stoll, R. P. Huebener, M. Naito
DOI 10.1103/PhysRevB.63.144511 · Physical Review B
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Abstract
Under quasi-voltage-bias, time-averaged measurements in epitaxial c−axis−oriented films of Nd2−xCexCuOy (NCCO) show the nucleation and growth of a high-electric-field domain. Time-resolved resistance measurements indicate spontaneous oscillations, apparently due to a breathing movement of the domain boundary. During the experiments the samples were immersed in superfluid helium at 1.92 K. The observed nonlinear phenomena suggest a strong electric-field dependence of the quasiparticle scattering rate. Since the symmetry of the pair wave function affects the electronic structure of the quasiparticle system, the correct symmetry in NCCO represents a crucial input of a model for explaining these observations.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nd2-xCexCuOy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 24 | Pressure not reported | onset |
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