Berlin 2024 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 36: Superconductivity: Theory I

TT 36.11: Talk

Wednesday, March 20, 2024, 12:15–12:30, H 3005

Zero-field finite-momentum and field-induced superconductivity in altermagnets — •Debmalya Chakraborty and Annica M. Black-Schaffer — Department of Physics and Astronomy, Uppsala University, Box 516, S-751 20 Uppsala, Sweden

We explore the possibilities for spin-singlet superconductivity in newly discovered altermagnets. Investigating d-wave altermagnets, we show that finite-momentum superconductivity can easily emerge in altermagnets even though they have no net magnetization, when the superconducting order parameter also has d-wave symmetry with nodes coinciding with the altermagnet nodes. Additionally, we find a rich phase diagram when both altermagnetism and an external magnetic field are considered, including superconductivity appearing at high magnetic fields from a parent zero-field normal state.

Keywords: Altermagnets; Superconductivity; Re-entrant superconductivity; Pair density waves; FFLO