Axions are a promising cold dark matter candidate. Haloscopes, which use the conversion of axions to photons in the presence of a magnetic field to detect axions, are the basis of microwave cavity searches such as the Axion Dark Matter eXperiment (ADMX). To search for lighter, low frequency axions in the sub 2×10−7 eV (50 MHz) range, a tunable lumped-element LC circuit has been proposed. For the first time, through ADMX SLIC (Superconducting Lc circuit Investigating Cold axions), a resonant LC circuit was used to probe this region of axion mass-coupling space. The detector used a superconducting LC circuit with piezoelectric driven capacitive tuning. The axion mass and corresponding frequency range 1.7498−1.7519×10−7 eV (42.31 -- 42.36 MHz), 1.7734−1.7738×10−7 eV (42.88 -- 42.89 MHz), and 1.8007−1.8015×10−7 eV (43.54 -- 43.56 MHz) was covered at magnetic fields of 4.5 T, 5.0 T, and 7.0 T respectively. Exclusion results from the search data, for coupling below 10−12GeV−1 are presented.
@article{arxiv.1911.05772,
title = {ADMX SLIC: Results from a Superconducting LC Circuit Investigating Cold Axions},
author = {N. Crisosto and G. Rybka and P. Sikivie and N. S. Sullivan and D. B. Tanner and J. Yang},
journal= {arXiv preprint arXiv:1911.05772},
year = {2020}
}