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arXiv · 2609.08144

Search for Axion Dark Matter around \texorpdfstring{$15.6\,\mu\text{eV}$}{15.6 microeV} with a Broadly Tunable High-Temperature Superconducting Cavity

Jiwon Lee·Jinsu Kim·Ohjoon Kwon·Saebyeok Ahn·Seonjeong Oh·Sergey Uchaikin·Boris Ivanov·Arjan Ferdinand van Loo·Yasunobu Nakamura·Dojun Youm·SungWoo Youn·HyoungSoon Choi
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Abstract

We report an axion dark matter search in the mass range of $15.30\text{--}15.85\,\mu\text{eV}$ using a broadly tunable high-temperature superconducting (HTS) haloscope. By soldering substrate-stripped rare-earth barium copper oxide (REBCO) films onto a copper shell, we achieved a quality factor 3--4 times higher than in copper cavities across its tuning band in an 8\text{-T} magnetic field. We set robust Frequentist 90\%~confidence-level exclusion limits on the axion--photon coupling down to 1.3 times the KSVZ coupling, while a complementary Bayesian analysis achieves KSVZ-level sensitivity.

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Jiwon Lee, Jinsu Kim, Ohjoon Kwon, Saebyeok Ahn, Seonjeong Oh, Sergey Uchaikin, Boris Ivanov, Arjan Ferdinand van Loo, Yasunobu Nakamura, Dojun Youm, SungWoo Youn, HyoungSoon Choi. 2026-09-08. Search for Axion Dark Matter around \texorpdfstring{$15.6\,\mu\text{eV}$}{15.6 microeV} with a Broadly Tunable High-Temperature Superconducting Cavity. https://arxiv.org/abs/2609.08144

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