Suppression of low-energy Andreev states by a supercurrent in YBa2Cu3O7-delta
J. Ngai, P. Morales, J. Y. T. Wei
Abstract
We report a coherence-length scale phenomenon related to how the high-Tc order parameter (OP) evolves under a directly-applied supercurrent. Scanning tunneling spectroscopy was performed on current-carrying YBa2Cu3O7-delta thin-film strips at 4.2K. At current levels well below the theoretical depairing limit, the low-energy Andreev states are suppressed by the supercurrent, while the gap-like structures remain unchanged. We rule out the likelihood of various extrinsic effects, and propose instead a model based on phase fluctuations in the d-wave BTK formalism to explain the suppression. Our results suggest that a supercurrent could weaken the local phase coherence while preserving the pairing amplitude. Other possible scenarios which may cause the observed phenomenon are also discussed.
Create a lesson
Related papers
Variational Monte Carlo Study of Superconductivity in a Correlated System with Broken Inversion Symmetry
Tsuyoshi Imazu, Katsunori Kubo
Predictions of superconducting properties from chemical bonding interactions
Francesco Belli, Trinidad Novoa, Ion Errea et al.
Exact Mirror-Parity Selection Rule for Electron-Phonon Coupling in Two-Dimensional Crystals
Nicolás F. Barrera, Javiera Cabezas-Escares, Francisco Munoz et al.
Ta-based S-I-S junctions for integrated superconducting electronics
Trent Borman, Cameron Bullock, Cole Chason et al.
Nonreciprocal charge transport in quantum materials: From superconductors to magnetic systems
Boning Yu, Yalei Huang, Alltrin Dhanarajagopal et al.
Intra-unit-cell Josephson scanning tunneling spectroscopy of the cuprate Bi1.2Pb0.8Sr2CaCu2O8+δ
Fengyu Yao, Jiong Mei, Wenjin Mao et al.