A method for the accurate measurement of the complex conductivity of high-T c superconductive thin films

Taber, R. C.; Merchant, Paul; Hiskes, R.; DiCarolis, Steve; Narbutovskih, M.

doi:10.1007/bf00618137

Cited by 13 publications

(5 citation statements)

References 9 publications

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“…The larger concentration of currents flowing near the edges in the narrow resonator leads to a larger kinetic inductance term than in other planar resonator methods. 17 Measurements were made in an unshielded cryostat, so that ''zero field'' measurements were made in the Earth's magnetic field. A superconducting magnet provided a field perpendicular to the films.…”

Section: Experimental Details and Resultsmentioning

confidence: 99%

“…Klein et al 16 have shown that relatively simple geometric correction factors can be employed to relate the measured and intrinsic quantities when using, for example, a parallel plate transmission line resonator. 7,8,17,18 For the coplanar transmission line resonator discussed here, the relationship between the measured and intrinsic quantities requires a numerical evaluation of the mw-current distribution. 19 In order to remove any ambiguity in the interpretation of data, as illustrated in Figs.…”

Section: Theoretical Modelsmentioning

confidence: 99%

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The nonlinear surface impedance of YBa2Cu3O7−δ thin films in zero and large applied fields

Powell¹,

Porch²,

Kharel³

et al. 1999

Journal of Applied Physics

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We present coplanar resonator measurements of the nonlinear microwave surface impedance of laser ablated and electron-beam coevaporated YBa2Cu3O7−δ thin films at 8 GHz in zero and applied magnetic fields, including the effects of irradiation with heavy ions. Correlations between the changes in surface resistance and reactance as a function of microwave current suggest that there are different contributions to the nonlinear behavior at low and high microwave currents in both zero and applied fields. In zero field, we suggest that microwave-induced flux lines are responsible for the observed nonlinear behavior, resulting in thermal runaway at large, sample dependent, microwave currents. The observed nonlinearity completely masks any possible contribution from the intrinsic pair breaking expected for a d-wave superconductor. In a magnetic field at relatively low currents, the nonlinearity can be described by the nonlinear dynamics of flux lines pinned by defects with a continuous range of pinning strengths. At higher currents, microwave field nucleation of flux lines is again considered important. On irradiation with 3.6 MeV/nucleon Xe-129 ions, the microwave losses and nonlinearity are significantly decreased in both zero and applied fields, which could have important implications for microwave device applications.

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Section: Experimental Details and Resultsmentioning

confidence: 99%

Section: Theoretical Modelsmentioning

confidence: 99%

The nonlinear surface impedance of YBa2Cu3O7−δ thin films in zero and large applied fields

Powell¹,

Porch²,

Kharel³

et al. 1999

Journal of Applied Physics

View full text Add to dashboard Cite

show abstract

“…[3][4][5] There have been many experimental techniques developed for the microwave surface impedance measurements since the discovery of HTS. [5][6][7][8][9][10][11][12] Most of them can accurately give the absolute value of the surface resistance while an absolute value of the magnetic penetration depth or surface reactance is hard to obtain. 6 The main difficulty is that itself is a very small value ͑on the order of tens to hundreds of nanometers͒.…”

Section: Introductionmentioning

confidence: 99%

Microwave propagation characteristics of a high-temperature superconducting variable spacing parallel plate transmission line

2001

Journal of Applied Physics

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Tunable microwave characteristics of a superconducting planar transmission line by using a nonlinear dielectric thin film A sinusoidal field solution for a high-temperature superconducting variable spacing parallel plate transmission line is derived. This solution demonstrates how to relate the propagation characteristics to the thicknesses and material parameters of the variable spacer and superconducting films in addition to the dielectric substrates. Then, a numerical analysis of the attenuation constant and phase velocity as a function of the dielectric spacer thickness is made. In addition, some further numerical results from this solution show that the roles played by the thicknesses of the two dielectric substrates are insignificant and can be neglected in practical microwave applications.

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“…A high sensitivity approach was adopted by the Stanford-Hewlett-Packard group and is based on measurements of the resonant frequency of microstrip and parallel plate resonators formed from high-TV YBa2-CU3O7-5 (YBCO) superconducting thin films [12][13][14][15]. More recently high sensitivity has also been achieved by Hardy et al [16] for single crystals using a cavity perturbation approach in a microcavity made from conventional superconductors.…”

mentioning

confidence: 99%

“…The details of the parallel plate resonator technique we employed are described elsewhere [12,13]. With this technique we obtain high resolution data with little scatter, especially at low temperatures.…”

mentioning

confidence: 99%

Microwave penetration depth measurements onBi2Sr2
Ma
¹
,
Taber
²
,
Lombardo
³

et al. 1993
Phys. Rev. Lett.
Self Cite
146
2
31
0
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The temperature dependence of the magnetic penetration depth of Bi2Sr2CaCu20g single crystals and YBa2Cii307-s thin films has been measured with a parallel plate resonator technique at microwave frequencies. Both materials show a T 2 temperature dependence between 10 and 25 K, and systematic deviations towards a flatter temperature dependence below 10 K. We have also calculated the real part of the complex conductivity of YBa2Cu307-$ thin films from our penetration depth and surface resistance data and compare them with those of YBa2Cu3C>7-a single crystals.

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A method for the accurate measurement of the complex conductivity of high-T c superconductive thin films

Cited by 13 publications

References 9 publications

The nonlinear surface impedance of YBa2Cu3O7−δ thin films in zero and large applied fields

The nonlinear surface impedance of YBa2Cu3O7−δ thin films in zero and large applied fields

Microwave propagation characteristics of a high-temperature superconducting variable spacing parallel plate transmission line

Microwave penetration depth measurements onBi2Sr2
Ma
¹
,
Taber
²
,
Lombardo
³

et al. 1993
Phys. Rev. Lett.
Self Cite
146
2
31
0
View full text Add to dashboard Cite

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A method for the accurate measurement of the complex conductivity of high-T c superconductive thin films

Cited by 13 publications

References 9 publications

The nonlinear surface impedance of YBa2Cu3O7−δ thin films in zero and large applied fields

The nonlinear surface impedance of YBa2Cu3O7−δ thin films in zero and large applied fields

Microwave propagation characteristics of a high-temperature superconducting variable spacing parallel plate transmission line

Microwave penetration depth measurements onBi2Sr2Ma1, Taber2, Lombardo3 et al. 1993Phys. Rev. Lett.Self Cite1462310View full textAdd to dashboardCite

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Microwave penetration depth measurements onBi2Sr2
Ma
¹
,
Taber
²
,
Lombardo
³

et al. 1993
Phys. Rev. Lett.
Self Cite
146
2
31
0
View full text Add to dashboard Cite