- Letter
Pressure-driven reentrant superconductivity in the heavy -electron superconductor with weak ferromagnetism in the normal state
Phys. Rev. B 111, L161113 – Published 15 April, 2025
DOI: https://doi.org/10.1103/PhysRevB.111.L161113
Abstract
Superconductivity beyond the conventional Bardeen-Cooper-Schrieffer framework often emerges out of a normal state that is accompanied by exotic magnetism and thereby displays many exceptional transport and thermodynamic properties. Here we report that the normal state of the heavy -electron superconductor is characterized by a weak ferromagnetism that persists up to room temperature. We show that the broad hump in its resistivity likely results from the Kondo interaction of the conduction electrons with this magnetism. By applying pressure, superconductivity is fully suppressed first. In the high-pressure regime, however, we observe a second dome of superconductivity with its maximum greater than the ambient pressure value, highlighting the possible unconventional superconductivity in this heavy -electron sulfide.