Flux-flow resistance in the cuprate superconductor Nd2- xCexCuOy: Spatial domains and spontaneous oscillations
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.
- Publication:
-
Physical Review B
- Pub Date:
- April 2001
- DOI:
- 10.1103/PhysRevB.63.144511
- Bibcode:
- 2001PhRvB..63n4511W
- Keywords:
-
- 74.25.Fy;
- 74.60.Ge;
- 74.72.Jt;
- Transport properties;
- Other cuprates including Tl and Hg-based cuprates