By integrating a dielectric microwave resonator with a piezoelectric-based strain device, we develop an in situ strain-tunable microwave spectroscopy technique that enables contactless measurements of superconducting properties under strain. In the slightly overdoped iron-based superconductor BaFe2(As1−xPx)2, we successfully observe a systematic strain dependence of the superconducting transition, manifested as changes in the quality factor and resonance frequency shifts. Both compressive and tensile anisotropic lattice distortions along the [110]T direction suppress superconductivity, consistent with standard transport measurements, highlighting the pivotal role of nematic fluctuations in the superconducting mechanism. Our strain-tunable cavity therefore serves as a powerful, contactless probe of fundamental superconducting material properties under strain and may also potentially facilitate the design of hybrid quantum systems with strain-controlled quantum degrees of freedom.
@article{arxiv.2504.10626,
title = {Development of microwave surface elastoresistivity measurement technique under tunable strain},
author = {Suguru Hosoi and Kohei Matsuura and Masaaki Shimozawa and Koichi Izawa and Shigeru Kasahara and Takasada Shibauchi},
journal= {arXiv preprint arXiv:2504.10626},
year = {2025}
}