Pressure dependence of superconductivity in CeRh₂As₂

In the recently discovered heavy fermion superconductor Formula Presented, a magnetic-field-induced phase transition has been observed inside the superconducting state, which is proposed to be a transition from an even- to an odd-parity superconducting state. The odd-parity superconducting state and its large upper critical field has been explained by local inversion symmetry breaking and consequent Rashba spin-orbit coupling. Here, we report the experimental tuning of the superconductivity in Formula Presented via applied pressure. Superconductivity is continuously suppressed up to 2.5 GPa. The kink in the upper critical field, which has been used to indicated the even- to odd-parity transition, is also suppressed, indicating the odd-parity state is suppressed faster than the even-parity state. Above 2.5 GPa, there might be a second dome of superconductivity, which requires further investigation.