Elena Hassinge, Max Planck Institute for Chemical Physics of Solids

May 19 at 2:00 pm (GMT+2) Paris time

In person : Room Boreau, building C, 2nd floor, an identity card will be requested at the entrance of ESPCI

Field-induced transition from even to odd parity superconductivity in CeRh2As2

Abstract :
I will report on the discovery of unconventional superconductivity in CeRh2As2. Although it appears at temperatures below 1 K, the superconducting state is extremely robust under the application of magnetic fields and presents a unique phase diagram.
Most interestingly, a field-induced phase transition within the superconducting state appears for c-axis fields in magnetisation, susceptibility and magnetostriction indicating two separate superconducting states.
The phase diagram can be understood by taking into account the staggered spin-orbit coupling at the Ce position. In that picture, the magnetic field drives a transition from even to odd parity superconductivity. The angle dependence of the critical fields strongly reinforces this interpretation. In the end, I will also give information on the ordered phases found in the normal state.

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