Temperature dependence of zero-bias conductance in a normal metal/ferromagneticsuperconductor junction

Abstract

In this study, we investigate the temperature dependence of zero-bias conductance (ZBC)in a normal metal/ferromagnetic superconductor (N/FS) junction where the ferromagneticsuperconductor (FS) is in three different Cooper pairing states: spin singlet s-wave pairing(SWP), spin triplet opposite spin pairing (OSP) and spin triplet equal spin pairing (ESP).We include the exchange field of the FS and effective mass mismatch (EMM) intwo sides of the junction. In the OSP case, the formation of mid-gap Andreevresonant states at the interface of the junction, extremely affects the ZBC withtemperature and exchange field. In the SWP and ESP cases, numerical results showvarious temperature dependences of the ZBC, depending on various exchange fields,h andx, wherex parameterizes the effect of the EMM. From the obtained results, not only can we estimatethe magnitude of the exchange field, but also we can learn more about the pairing of theFS. Also the results show that, in comparison with experimental data, the inclusion ofEMM is essential.