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TT: Fachverband Tiefe Temperaturen

TT 66: Superconductivity: Yu-Shiba-Rusinov and Andreev Physics

TT 66.9: Talk

Thursday, March 21, 2024, 11:45–12:00, H 3005

Thermocurrent spectroscopy of Yu-Shiba-Rusinov states in single-molecule junctions — •Pascal Gehring — IMCN/NAPS, Université Catholique de Louvain, Louvain-la-Neuve, Belgium

The interaction between magnetic impurities and superconductors leads to fascinating phenomena resulting from the competition between Kondo screening and Cooper pair formation. For example, individual magnetic impurities can form states within the superconducting gap, called Yu-Shiba-Rusinov (YSR) bound states, that create sharp features in the density of states. Here, We employ our recently developed thermocurrent spectroscopy set-up to experimentally study the thermoelectric properties of a neutral and stable all-organic radical molecule coupled to proximity induced superconducting break-junction electrodes at millikelvin temperatures. We find that the sharp YSR features also result in a strong enhancement of their thermoelectric response. By varying the external magnetic field a quantum phase transition from the Kondo into the YSR regime is induced with a two-fold increase of the thermoelectric current.

Keywords: Yu-Shiba-Rusinov states; Kondo; Single-molecule junction; Thermoelectricity