Colloquium
Department of Physics, NCU
Does Triplet Superconductor Exist at Superconductor/Ferromagnet Interface?
Prof. Hsiung Chou
Department of Physics, National Sun Yat-sen University
Date 2021.04.27 (Tue)
Place S4-625
Time 14:00-16:00
Abstract: Conventional spin-singlet superconductivity diminishes with increasing internal or external magnetic field. When a spin-singlet superconductor and a ferromagnet are brought into contact, the singlet cooper pairs penetrate only few nanometers before the FM exchange field completely destroys the phase coherence of paired electron spins. In the other hand, if the exchange coupling acts on the superconducting layer by the interface, the triplet superconductive states could be generated. This phenomenon was claimed to achieve since 2006 on the low-Tc-superconductor/metallic-ferromagnetic-material system. However, not everyone agrees with the conclusion and argued that it might originate other tunneling effect. Moreover, the long distance tunneling of superconducting pairs via strong magnetic material in high-Tc-superconductor/magnetic-oxide system has not been discovered. In this talk, I would like to address these problems and share what we have tried on this issue.