Dresden 2026 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 91: Superconductivity: Theory II
TT 91.1: Talk
Thursday, March 12, 2026, 17:30–17:45, HSZ/0101
Superconducting length scales and currents from first principles — Mitsuaki Kawamura1, Takuya Nomoto2, •Niklas Witt3, and Ryotaro Arita4,5 — 1Yokohama National University, Japan — 2Tokyo Metropolitan University, Japan — 3JMU Würzburg, Germany — 4University of Tokyo, Japan — 5RIKEN CEMS, Japan
Superconducting length scales, namely the coherence length and the penetration depth, as well as critical currents, are central to the performance of superconductors but remain challenging to obtain from first principle calculations. While density functional theory for superconductors (SCDFT) has been widely used to predict transition temperatures, magnetic and current related superconducting properties are far less explored.
We present a fully ab initio implementation of a recently introduced method [1] within SCDFT, which gives access to superconducting length scales and depairing currents by introducing a finite-momentum pairing constraint. The approach has been integrated into the open-source superconducting-toolkit (SCTK) [2] and applied to representative elemental, alloy, and high-pressure hydride superconductors. The results demonstrate a viable route to predicting magnetic superconducting properties directly from electronic structure calculations.
[1] N. Witt et al., npj Quantum Mater. 9, 100 (2024)
[2] M. Kawamura et al., Phys. Rev. B 101, 134511 (2020)
Keywords: critical magnetic field; critical current; coherence length; London penetration depth; DFT