Regensburg 2025 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 5: Superconductivity: Properties and Electronic Structure I
TT 5.13: Vortrag
Montag, 17. März 2025, 12:45–13:00, H36
Vortex mass observed in far-infrared circular dichroism of high-Tc superconductors — •Roman Tesař1, Michal Šindler1, Pavel Lipavský2, Jan Koláček1, Christelle Kadlec1, Wen-Yen Tzeng3, Chih-Wei Luo4, and Jiunn-Yuan Lin4 — 1Institute of Physics, Czech Academy of Sciences, Prague, Czech Republic — 2Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic — 3National Formosa University, Yunlin, Taiwan — 4National Yang Ming Chiao Tung University, Hsinchu, Taiwan
The effective mass of the Abrikosov vortex (fluxon) in type-II superconductors remains an open and still not fully solved problem. Only a few experimental techniques are currently known to examine the fluxon mass, while numerous theoretical models have been developed that predict inconsistent values scattered over several orders of magnitude. We present an experimental method to determine fluxon mass based on the interaction with circularly polarized FIR/THz laser radiation. A rotating electric field induces the motion of fluxons along cyclotron trajectories, which leads to magnetic circular dichroism at terahertz frequencies. The modified Kopnin-Vinokur theory with experimentally established parameters provides a sufficient framework for estimating fluxon mass at low temperatures. We demonstrate the proposed method on thin films of YBa2Cu3O7−δ with different doping levels. We also briefly mention other applications of the experimental technique used, such as probing cyclotron resonance in semiconductors and magnon modes in magnetic materials.
[1] Sci. Rep. 11, 21708 (2021).
[2] IEEE Trans. Appl. Supercond. 34, 0601005 (2024).
Keywords: mass of Abrikosov vortex; high-temperature superconductor; magnetic circular dichroism; terahertz radiation