Temperature dependences of the surface resistance and the diamagnetic shielding susceptibility at Tc-T<<Tc for high-Tc superconductors
Abstract
At Tc-T<<Tc(i.e., near Tc), in order to demonstrate the condudction mechanism and temperature dependencies of the diamagnetic-shielding susceptibility and the penetration depth, we fabricated Ba1xBiO3(BKBO) thin films and measured the energy gap by tunnel effect and shielding susceptibilities which are compared with those measureed for BKBO and YBCO single crystals. The shielding susceptibilities for BKBO and YBCO single crystals well-fit (T)/(0)=1-exp(-2(T)/kBT), while that for the BKBO film follows (T)/(0)=1-T/Tc) which may not be intrinsic. The exponential decrease of the susceptibilities near Tc indicates that the conduction mechanism is hopping. The energy gaps are observed as 2(0)=(3.5+-0.1)kBTc for the BKBO film by the tunnel effect, 2(0)=(3.9+-0.1)kBTc for the BKBO single crystal, and 2(0)=(8+-0.2)kBTc for the YBCO single crystal. Furthermore, for microwave device applications of superconductors, at Tc-T<<Tc, the surface resistance Rs(T) is derived from the surface impedance at ωτ(tr)<<1, where σs(0) and σn are the conductivities of the superconducting state and the normal state, respectively, and f(T)=(T)/(0)=1-exp(-2(T)/kBT).
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