Signature of a crossed Andreev reflection effect in the magnetic response of YBa2Cu3O7−δ junctions with the itinerant ferromagnet SrRuO3
P. Aronov, G. Koren
DOI 10.1103/PhysRevB.72.184515 · 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
The magnetic properties of superconducting-ferromagnetic-superconducting (SFS) and SF ramp-type junctions with YBa2Cu3O7−δ (YBCO) electrodes (S) and the itinerant ferromagnet SrRuO3 (SRO-F), were investigated. We looked for a crossed Andreev reflection effect (CARE) in which an electron from one magnetic domain in F is Andreev reflected as a hole into an adjacent, oppositely polarized, domain while a pair is transmitted into S. The CARE is possible in SRO since the width of its domain walls is of the order of the YBCO coherence length (2–3nm). Our junctions behave as typical magnetic tunneling junctions, as the conductance spectra were always asymmetric and a few showed bound-state peaks at finite bias that shifted with field according to classical Tedrow-Meservey theory. In many of our SFS junctions with a barrier thickness of 10–20nm, a prominent zero-bias conductance peak (ZBCP) has been observed. This peak was found to decrease linearly with magnetic field, as expected for Andreev and CARE scattering. In contrast, in SF junctions, the observed ZBCP was found to decrease versus field almost exponentially, in agreement with the Anderson-Appelbaum theory of scattering by magnetic states in F. Thus, transport in our SFS and SF junctions depends strongly on the size of the F layer. We also found that in both cases, the ZBCP height at zero field decreased with increasing magnetic order of the domains in F, in agreement with the CARE mechanism.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 88.5 | Pressure not reported | unknown |
Similar papers
Andreev reflection in YBa2Cu3O7−δ∕La0.67Ca0.33MnO3: Existence of midgap states in the {110} surface of YBa2Cu3O7−δ
similarity 0.95P. S. Luo et al.
Source status unknown — claims are unverified
Spin-polarized transport across a La0.7Sr0.3MnO3/YBa2Cu3O7−x interface: Role of Andreev bound states
similarity 0.95Z. Y. Chen et al.
Source status unknown — claims are unverified
Tunneling spectroscopy of the quasiparticle Andreev bound state in ion-irradiated YBa2Cu3O7−δ/Pb junctions
similarity 0.94M. Aprili et al.
Source status unknown — claims are unverified
Weak magnetism in insulating and superconducting cuprates
similarity 0.94G. M. De Luca et al.
Source status unknown — claims are unverified
Transition from a Mixed to a Pure d-Wave Symmetry in Superconducting Optimally Doped YBa2Cu3O7−x Thin Films Under Applied Fields
similarity 0.94G. Elhalel et al.
Source status unknown — claims are unverified
Unusual magnetic-field dependence of the electrothermal conductivity in the mixed state of cuprate superconductors
similarity 0.94J. A. Clayhold et al.
Source status unknown — claims are unverified