Observation of Andreev bound states in bicrystal grain-boundary Josephson junctions of the electron-doped superconductor La2−xCexCuO4−y
B. Chesca, M. Seifried, T. Dahm, N. Schopohl, D. Koelle, R. Kleiner, A. Tsukada
DOI 10.1103/PhysRevB.71.104504 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
We observe a zero-bias conductance peak (ZBCP) in the ab-plane quasiparticle tunneling spectra of thin film grain-boundary Josephson junctions made of the electron-doped cuprate superconductor La2−xCexCuO4−y. An applied magnetic field reduces the spectral weight around zero energy and shifts it nonlinearly to higher energies consistent with a Doppler shift of the Andreev bound states (ABS) energy. For all magnetic fields the ZBCP appears simultaneously with the onset of superconductivity. These observations strongly suggest that the ZBCP results from the formation of ABS at the junction interfaces, and, consequently, that there is a sign change in the symmetry of the superconducting order parameter of this compound consistent with a d-wave symmetry.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La2-xCexCuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 29 | Pressure not reported | onset |
Similar papers
Observation of Andreev bound states in bicrystal grain-boundary Josephson junctions of the electron doped superconductor LaCeCuO
similarity 0.99B. Chesca et al. · 2004 · arXiv:cond-mat/0402131
Source status unknown — claims are unverified
Phase Diagram of the Electron-Doped La2−xCexCuO4 Cuprate Superconductor from Andreev Bound States at Grain Boundary Junctions
similarity 0.96M. Wagenknecht et al.
Source status unknown — claims are unverified
Observation of Two Andreev-Like Energy Scales in La2−xSrxCuO4 Superconductor–Normal-Metal–Superconductor Junctions
similarity 0.94G. Koren & T. Kirzhner
Source status unknown — claims are unverified
X-ray-absorption near-edge-structure study of La2−x(Ba,Sr)xCuO4−y superconductors
similarity 0.93J. M. Tranquada et al.
Source status unknown — claims are unverified
Superconductivity phase diagrams for the electron-doped cuprates R2−xCexCuO4 (R=La, Pr, Nd, Sm, and Eu)
similarity 0.93Y. Krockenberger et al.
Source status unknown — claims are unverified
Importance of grain-boundary Josephson junctions in the electron-doped infinite-layer cuprate superconductor Sr1−xLaxCuO2
similarity 0.93J. Tomaschko et al.
Source status unknown — claims are unverified