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cond-mat.supr-con2026

Anomalous Microwave Response in YBCO Resonators beyond the Two-Level-System Model

Kaiwen Zheng, Nathan J. Johnson, Nathan T. Thobaben +5

The paper measures the microwave response of YBCO coplanar-waveguide resonators at millikelvin temperatures and finds anomalous quality‑factor and frequency shifts that cannot be e…