A study on the microwave responses of YBCO and TBCCO thin films by coplanar resonator technique |
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Authors: | Shi Li-Bin Wang Yun-Fei Ke Yu-Yang Zhang Guo-Hu Luo Sheng Zhang Xue-Qiang Li Chun-Guang Li Hong and He Yu-Sheng |
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Institution: | Department of Physics, University of Science and Technology Beijing, Beijing 100083, China; Department of Physics, Bohai University, Jinzhou 121000, China; Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China |
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Abstract: | YBa2Cu3O7(YBCO) thin films have been prepared by
thermal coevaporation on LaAlO3(LAO) substrates, and
Tl2Ba2CaCu2O8(TBCCO) thin films are synthesized
by magnetron sputtering method on LAO substrates. The transition
temperature Tc is 90\,K for YBCO/LAO and 104\,K for
TBCCO/LAO. Microwave responses of the films are studied
systematically by coplanar resonator technique. Energy gaps of the
films obtained are {\it\Delta}0=1.04kBTc for YBCO
films and ${\it\Delta}_0=0.84kBTc for TBCCO films by
analysing the temperature dependence of resonant frequencies of
coplanar resonator. Penetration depth at 0\,K \lambda 0=198nm
for YBCO films and \lambda0 =200nm for TBCCO films could also
be obtained by using the weak coupling theory and two fluid theory.
Results of penetration depth and energy gap confirm the weak coupling
properties of the films. In addition, microwave surface resistances
Rs of YBCO/LAO and TBCCO/LAO are also investigated by
analysing the quality factor and insert loss of the coplanar
resonator. Surface resistance of TBCCO/LAO is less than that of
YBCO/LAO, so that TBCCO/LAO films may have more potential
applications. |
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Keywords: | YBCO TBCCO superconducting
films coplanar resonator |
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