Pressure dependence of superconductivity in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi mathvariant="normal">CeRh</mml:mi><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi mathvariant="normal">As</mml:mi><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>
Hasan Siddiquee, Zackary Rehfuss, Christopher Broyles, Sheng Ran
Abstract
In the recently discovered heavy fermion superconductor ${\mathrm{CeRh}}_{2}{\mathrm{As}}_{2}$, 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 ${\mathrm{CeRh}}_{2}{\mathrm{As}}_{2}$ 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.