Dresden 2026 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 17: Focus Session: High-Temperature Superconductivity in Hydride Materials at High Pressures (joint session TT/DS)
DS 17.6: Vortrag
Donnerstag, 12. März 2026, 17:45–18:00, HSZ/0003
1H-NMR investigations of bulk superconductivity in superhydrides using Lenz lenses — •F. Bärtl1,2, D. Zhou3, T. Helm1, S. Luther1, H. Kühne1, J. Wosnitza1,2, and D. Semenok3 — 1HLD-EMFL, HZDR, Dresden — 2IFMP, TUD, Dresden — 3HPSTAR, Beijing
The discovery of near-room-temperature superconductivity at ultrahigh pressures in superhydrides has kindled intensive research activities in the past years. However, the need to use diamond-anvil cells (DACs) for the synthesis and study of such superconductors limits the number of available experimental techniques. Nuclear magnetic resonance (NMR) spectroscopy is a key technique to study the bulk properties of superconducting materials, but it usually requires sample masses of several milligrams. Here, we present our 1H NMR measurements of several superhydride preparations, using Lenz lenses, which act as magnetic-flux transformers in the NMR experiment and enable the investigation of samples with masses in the microgram range in the sample chamber of DACs. We observe several features that evidence the bulk nature of the superconducting transition in the superhydrides, the most prominent being the suppression of the 1H nuclear spin-lattice relaxation rate 1/T1T ∝ D(EF)2. Furthermore, we report on the systematic occurrence of a rate enhancement in the regime of the superconducting transition, which is reminiscent of a Hebel-Slichter-like peak.
Keywords: superconductivity; superhydrides; NMR; Lenz lenses; high pressure