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TT: Fachverband Tiefe Temperaturen

TT 39: Focus Session: Nickelate Superconductivity: Insights into Unconventional Pairing and Correlation Effects I (joint session TT/DS/MA)

TT 39.1: Topical Talk

Mittwoch, 11. März 2026, 09:30–10:00, HSZ/0003

Unconventional Superconductivity in Infinite-layer Samarium Nickelates — •Danfeng Li — City University of Hong Kong, Kowloon, Hong Kong SAR, China

Infinite-layer nickelates have emerged as a frontier platform for studying unconventional superconductivity beyond the cuprates. In this talk, I will present our recent advances on samarium-based infinite-layer nickelate thin films, which exhibit enhanced superconductivity and a mixed two- and three-dimensional superconducting character arising from strong coupling between rare-earth 5d and Ni 3d orbitals. I will further highlight our discovery of robust field-induced re-entrant superconductivity in heavily Eu-doped Sm_0.95−xCa_0.05Eu_xNiO₂, where superconductivity suppressed at low fields re-emerges above 6 T and persists to 45 T. This exotic high-field state results from the interplay between NiO-plane superconductivity and Eu²⁺-sublattice ferromagnetism, revealing a unique coexistence of magnetism and superconductivity within a single material system. These findings demonstrate how rare-earth-site engineering and magnetic-field tuning provide powerful routes for realising and manipulating high-temperature ferromagnetic superconductivity.
[1] M. Yang, H. Wang, J. Tang, J. Luo et al., arXiv:2503.18346 (2025).
[2] M. Yang, J. Tang, X. Wu, H. Wang et al., arXiv:2508.14666 (2025).

Keywords: Infinite-layer nickelate; Re-entrant superconductivity; Samarium nickelate; Unconventional superconductivity