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arXiv · 2510.15538

Microwave surface resistance of Tl-1223 films in a dc magnetic field

Alessandro Magalotti·Andrea Alimenti·Emilio Bellingeri·Cristina Bernini·Sergio Calatroni·Alessandro Leveratto·Enrico Silva·Kostiantyn Torokhtii·Ruggero Vaglio·Pablo Vidal García·Nicola Pompeo
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Abstract

We present first preliminary surface impedance measurements on Tl-1223 films in dc magnetic fields, in view of potential applications for the next generation Future Circular Collider (FCC-hh) at CERN. The Tl-1223 samples were produced through laser ablation, with nominal thickness of 1 {\mu}m and grown on a thick LaAl2O3 substrate. The presence of Tl-1212 phase identified by XRD and BSE microscopy, could be avoided by changing the oxygen partial pressure during heat treatment. The high-frequency transport properties of the samples were characterized using microwave resonant devices, at fixed frequencies of 14.9 GHz, 24.2 GHz and 26.7 GHz, in the temperature range 40 K to 140 K. An external applied static magnetic field up to 12 T was applied. Samples from subsequent batches exhibited huge improvements in the microwave properties, confirming the progress in the deposition technique.

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Alessandro Magalotti, Andrea Alimenti, Emilio Bellingeri, Cristina Bernini, Sergio Calatroni, Alessandro Leveratto, Enrico Silva, Kostiantyn Torokhtii, Ruggero Vaglio, Pablo Vidal García, Nicola Pompeo. 2025-10-17. Microwave surface resistance of Tl-1223 films in a dc magnetic field. https://doi.org/10.1109/tasc.2026.3662298

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