Microwave surface impedance at 10 GHz and quasiparticle scattering in YBa2Cu3O7 films

Gao, Feng; Kruse, J.; Platt, C. E.; Feng, Milton; Klein, Miles V.

doi:10.1063/1.110527

Cited by 48 publications

(20 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As an example, in microwave absorption experiments one often measures mostly the elastic and/or inelastic scattering of quasiparticles and not primarily their energy relaxation. Indeed, the quasiparticle scattering rate below T c determined from the microwave surface impedance of YBa 2 Cu 3 O 7Ϫ␦ films 19 and single crystals 20 also decreases with decreasing temperature. However, this decrease is much less rapid than our results for Ϫ1 shown in Fig.…”

Section: Discussionmentioning

confidence: 95%

Quasiparticle energy relaxation in the cuprate superconductors

et al. 1997

View full text Add to dashboard Cite

At high flux-flow velocities in the mixed state of a type-II superconductor the nonequilibrium distribution of the quasiparticles is shifted to higher energies. As shown theoretically by Larkin and Ovchinnikov, a distinct signature of this nonequilibrium effect is an electronic instability, resulting in a sharp kink in the currentvoltage characteristic at a critical vortex velocity v * . From measurements of v * the quasiparticle-energy relaxation rate Ϫ1 can be found. We have measured this instability point for epitaxial c axis oriented films of La 1.85 Sr 0.15 CuO 4Ϫx and YBa 2 Cu 3 O 7Ϫ␦ . In both cuprates the observed temperature dependence of Ϫ1 could be well fitted with the function Ϫ1 ϭa exp͓Ϫ2⌬(T)/k B T͔, suggesting that the electron-electron recombination process, perhaps in combination with the emission of another excitation, is crucial. As an example of a low-T c superconductor we have also studied amorphous Mo 3 Si films and found that Ϫ1 can be fitted by a function similar to that we have used for the cuprates, again indicating the importance of the electron-electron interaction. ͓S0163-1829͑97͒07745-X͔

show abstract

Section: Discussionmentioning

confidence: 95%

Quasiparticle energy relaxation in the cuprate superconductors

et al. 1997

View full text Add to dashboard Cite

show abstract

“…Please note that we can only determine data for the temperature regime of guided flux motion. For comparison, experimental data obtained via pulse measurements 25,26 and microwave experiments 32,33 are added. At temperatures between 40 and 70 K, inelastic quasiparticle scattering times of τ in ≈ 10 −11 s are obtained; τ in decreases slightly with temperature.…”

Section: Discussionmentioning

confidence: 99%

Regimes of flux transport at microwave frequencies in nanostructured high-Tcfilms

et al. 2012

View full text Add to dashboard Cite

We report on combined dc and microwave electronic measurements of magnetic flux transport in micron and submicron-patterned high-T c films. In a given temperature regime below the superconducting transition temperature T c , the current-driven flux transport is restricted to flux motion guided by the submicron patterns. Via frequency-dependent measurements of the forward transmission coefficient S 21 it is demonstrated that the mechanism of the guided flux transport depends on the microwave frequency and the geometrical size of the superconducting structures. At low frequencies, flux is transported via Abrikosov vortices leading to additional microwave losses. Above a geometrically defined frequency, a different mechanism seems to be responsible for flux transport that does not contribute to the microwave losses and most likely represents a phase-slip type mechanism. The limiting vortex velocity obtained from the frequency dependence of the microwave properties agrees with the Larking-Ovchinnikov critical vortex velocity that is determined via dc pulse measurements. In spite of the change of mechanism, guidance of flux persists in these nanopatterns up to high frequencies of several GHz.

show abstract

“…This appears consistent with the other experimental data for YBa 2 Cu 3 O 7Ϫ␦ . [10][11][12][13] The temperature-dependent electrother-mal conductivity displayed by the dashed curve in Fig. 3 also removes the discrepancy of the thermal Hall angle ␣ discussed above.…”

Section: ͑8͒mentioning

confidence: 78%

“…For example, measurements of the microwave surface resistance of YBa 2 Cu 3 O 7Ϫ␦ have shown a strong decrease of the inelastic quasiparticle scattering rate with decreasing temperature and an abrupt change of its temperature dependence near T c . 10,11 Furthermore, below T c a particularly strong decrease of the quasiparticle scattering rate has also been found in measurements of the thermal conductivity 12 and of the thermal Hall conductivity 13 of YBa 2 Cu 3 O 7Ϫ␦ . Hence, below T c , the quasiparticle transport cannot be obtained simply by extrapolation from the normal state above T c .…”

Section: Electrothermal Conductivity S N "T…/ N "T… Below T Cmentioning

confidence: 82%

Quasiparticle transport belowTcin the cuprate superconductors

Gollnik

Huebener

1998

Phys. Rev. B

View full text Add to dashboard Cite

The interpretation of experimental data on the Nernst and Seebeck effects in the mixed state of a type-II superconductor requires a careful treatment of the temperature-dependent electrothermal conductivity S n (T)/ n (T) below T c ͑S n ϭSeebeck coefficient, n ϭresistivity͒. For the cuprate superconductors such as YBa 2 Cu 3 O 7Ϫ␦ , a simple extrapolation from the normal-state behavior above T c is inadequate and can lead to erroneous results, due to the opening of the superconducting energy gap and its effect on the temperature dependence of the quasiparticle scattering rate. In particular, the value of the thermal Hall angle of vortex motion depends sensitively on the correct treatment of the electrothermal conductivity below T c . Taking experimental data for YBa 2 Cu 3 O 7Ϫ␦ films as an example, we show that the thermal Hall angle of vortex motion obtained from the data attains the expected small value only if the opening of the energy gap below T c is taken into account.

show abstract

Microwave surface impedance at 10 GHz and quasiparticle scattering in YBa2Cu3O7 films

Cited by 48 publications

References 17 publications

Quasiparticle energy relaxation in the cuprate superconductors

Quasiparticle energy relaxation in the cuprate superconductors

Regimes of flux transport at microwave frequencies in nanostructured high-Tcfilms

Quasiparticle transport belowTcin the cuprate superconductors

Contact Info

Product

Resources

About