Andreev bound state tunneling: spectroscopy of unconventional superconductivity

Elvira Badica; Marco Aprili; Mark W. Covington; Laura H. Greene

doi:10.1117/12.397867

6 September 2000 Andreev bound state tunneling: spectroscopy of unconventional superconductivity

Elvira Badica, Marco Aprili, Mark W. Covington, Laura H. Greene

Proceedings Volume 4058, Superconducting and Related Oxides: Physics and Nanoengineering IV; (2000) https://doi.org/10.1117/12.397867
Event: AeroSense 2000, 2000, Orlando, FL, United States

Abstract

Planar tunneling spectroscopy is used to investigate the quasi- particle density of states of YBCO. The tunneling conductance, taken as a function of temperature, magnetic field, crystallographic orientation, Pr, Zn and Ni doping and ion-induced damage confirms that the observed zero-bias conductance peak (ZBCP) is an Andreev Bound State (ABS). This ABS occurs at the interface of an unconventional superconductor, that breaks the order parameter reflectional symmetry: in this case, the (110) surface of YBCO. An applied magnetic filed causes a splitting of the ZBCP, which is due to the Doppler shift arising from the scalar product of the quasiparticle velocity with the superfluid momentum, V_F(DOT)P_S. A dramatic dependence of the ZBCP splitting with the direction of the applied field demonstrates that the transport properties of the ABS are highly anisotropic with respect to the crystal axes. In zero field, the ZBCP splits below T_s approximately 8K, which is a manifestation of a phase transition into a state that breaks time-reversal symmetry.

Citation Download Citation

Elvira Badica, Marco Aprili, Mark W. Covington, and Laura H. Greene "Andreev bound state tunneling: spectroscopy of unconventional superconductivity", Proc. SPIE 4058, Superconducting and Related Oxides: Physics and Nanoengineering IV, (6 September 2000); https://doi.org/10.1117/12.397867

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