Speaker
Description
Magnetism is generally detrimental to superconductivity, but in unconventional systems the two coexist and give rise to exotic phenomena such as spin-triplet pairing and field-induced superconductivity. In the infinite-layer nickelate series SmEuCaNiO2 (SECNO), samples with specific Eu concentrations exhibit field-reentrant superconductivity, which has been attributed to Jaccarino-Peter (JP) compensation driven by Eu2+ magnetic moments.
In this talk, I will further present a striking observation of a hysteretic superconducting state in SECNO, emerging below 2 K with coercive field exceeding 1 T, unprecedented among known ferromagnetic superconductors or superconducting heterostructures. Complementary evidence, together with the Eu-concentration dependence, points to an intrinsic underlying ferromagnetic ground state spanning the SECNO series. By revealing the coexistence of ferromagnetism and superconductivity, our work provides critical insights into the interplay among ferromagnetic order, JP compensation, and Eu doping in SECNO. This field-history-dependent superconducting state enriches the fundamental physics of correlated oxides.