Order parameter oscillations in Fe/Ag/Bi2Sr2CaCu2O8+delta tunnel junctions

Article

关键词: FERROMAGNET;    SUPERCONDUCTORS;    SYMMETRY;    STATES;    FILMS;   

DOI  :  10.1103/PhysRevB.68.060507

来源: SCIE

【 摘 要 】

We have performed temperature-dependent tunneling conductance spectroscopy on Fe/Ag/Bi2Sr2CaCu2O8+delta (BSCCO) planar junctions. The multilayered Fe counterelectrode was designed to probe the proximity region of the ab plane of BSCCO. The spectra manifested a coherent oscillatory behavior with magnitude and sign dependent on the energy, decaying with increasing distance from the junction barrier, in conjunction with the theoretical predictions involving d-wave superconductors coupled with ferromagnets. The conductance oscillates in antiphase at E=0 and E=+/-Delta. The zero-bias conductance peak behavior is explained by a spin-dependent energy shift and the presence of a broken time-reversal pairing symmetry, which do not depend on the geometrical characteristics of the ferromagnetic film.

【 授权许可】

Free