Flux line induced microwave losses in YBCO thin films

Experimental study of the inductance of pinned vortices in superconductingYBa2Cu3OPesetski1, Lemberger2 2000Phys. Rev. B9410View full textAdd to dashboardCite

“…21 The experimental Labusch parameter exp is derived from Figure 2 shows exp vs T. The value of exp at Tϭ0 is typical for PLD YBCO films. [1][2][5][6][7][8][9][10][11][12] Note that exp decreases linearly with T at low T, then vanishes as T→T G . Our experiment was conducted at frequencies too low to observe the dissipative part of the vortex resistivity, except within a few degrees of T G .…”

High-frequency vortex dynamics in

“…To find out the accuracy of such an interpolation, one should compare the prediction of the Coffey-Clem model for the field derivative of the surface resistance and reactance at T = T c and H = H c2 with the results of microscopic theory. Such a theory was developed by Caroli and Maki [28] 0-9 45 MHz-50 GHz YBCO thin film Corbino disk Owliaei et al [51] 0-8 10 GHz YBCO thin film cavity resonator Golosovsky et al [53] 0-0.8 5.5 GHz parallel-plate YBCO thin film resonator Ghosh et al [54] 0-7 11 GHz parallel-plate YBCO thin film resonator Revenaz et al [55] 0-6 1-20 GHz YBCO thin film stripline resonator Xavier et al [56] 0-7 5 MHz-5 GHz Ho-Ba-Cu-O stripline thin film Morgan et al [45] 4 27 GHz YBCO cavity resonator single crystal Matsuda et al [59] 0-6 30 GHz YBCO single crystal bolometry Wu and Sridhar [24] 0-0.02 6 MHz rf oscillator YBCO single crystal Hebard et al [23] 1-14 1.25 kHz YBCO thin film kinetic inductance Kunchur et al [68] 0-8 Pulsed d.c. current YBCO thin film Doettinger et al [40] 0-4 High d.c. current YBCO thin film Bulaevskii et al [114] Reversible BSCCO magnetization single crystal Hanaguri et al [62] 2-5 44 MHz rf resonator BSCCO single crystal [76] and Thompson [77] (in the context of conventional superconductors) who found…”

“…Typical complex impedance studies include measurement of the magnetic-field-dependent Q-factor and the resonant frequency of a microwave resonator with superconductor. A superconductor may (i) be mounted inside a copper resonant cavity [45][46][47][48][49], (ii) serve as an end-plate of a copper cavity [50,51], (iii) form a resonator by itself (parallel-plate resonator [52][53][54], microstripline [55][56][57], dielectric resonator [44]), (iv) terminate a coaxial cable [58]. Viscosity (but not the pinning constant!)…”

Upward curvature of the microwave surface resistance vs. field in YBCO films and the Clem's Rs model

“…In contrast, the fitting with R,.c~om to the 6 GHz data (H-I-Brow) gives, as recognized in Ref. 11, quantitatively and qualitatively incorrect trends (Fig. 4).…”

“…S. Ghosh et aL (1994) on microwave losses induced by flux motion in YBCO thin films are discussed, which seem to contradict a generalized use of the surface resistance model proposed by Coffey and Clem (1992) …”