New surface resistance measurement technique of high-temperature superconductors using a probe coupling microstrip line resonator

We have developed a new surface resistance (R_s) measurement technique of high-temperature superconductors using a probe coupling microstrip line resonator. In this technique, the probe coupling method is used to measure the R_s of superconductors without attaching any contacts to the superconductors. This paper reports the measurement process of the R_s of a superconducting fine-wire using this technique. The quality factors of the copper wires, gold fine-wire and the Bi-Sr-Ca-Cu-O whisker crystal were measured by the probe coupling resonator method. The measurement results revealed that this technique is feasible for the R_s measurement of the superconducting fine-wire