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We measure the thickness of YBa2Cu3O7−δ (YBCO) films at a microwave frequency of 39.91 GHz noninvasively by using the single two-resonance-mode sapphire resonator (TSR) method. In the TSR method, a single sapphire resonator is used for measuring the effective surface resistance (RS,eff) and the penetration depth (λ) of the YBCO films at the same frequency at temperatures of 6–88 K. Five YBCO films...
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