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Sergeev, A. V.; Semenov, A. D.; Kouminov, P.; Trifonov, V.; Goghidze, I. G.; Karasik, B. S.; Gol’tsman, G. N.; Gershenzon, E. M. |
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Title |
Transparency of a YBa2Cu3O7-film/substrate interface for thermal phonons measured by means of voltage response to radiation |
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Journal Article |
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Year |
1994 |
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Phys. Rev. B Condens. Matter. |
Abbreviated Journal |
Phys. Rev. B Condens. Matter. |
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49 |
Issue |
13 |
Pages |
9091-9096 |
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YBCO films |
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Abstract |
The transparency of a film/substrate interface for thermal phonons was investigated for YBa2Cu3O7 thin films deposited on MgO, Al2O3, LaAlO3, NdGaO3, and ZrO2 substrates. Both voltage response to pulsed-visible and to continuously modulated far-infrared radiation show two regimes of heat escape from the film to the substrate. That one dominated by the thermal boundary resistance at the film/substrate interface provides an initial exponential decay of the response. The other one prevailing at longer times or smaller modulation frequencies causes much slower decay and is governed by phonon diffusion in the substrate. The transparency of the boundary for phonons incident from the film on the substrate and also from the substrate on the film was determined separately from the characteristic time of the exponential decay and from the time at which one regime was changed to the other. Taking into account the specific heat of optical phonons and the temperature dependence of the group velocity of acoustic phonons, we show that the body of experimental data agrees with acoustic mismatch theory rather than with the model that assumes strong diffusive scattering of phonons at the interface. |
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0163-1829 |
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PMID:10009690 |
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1648 |
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Coumou, P. C. J. J.; Driessen, E. F. C.; Bueno, J.; Chapelier, C.; Klapwijk, T. M. |
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Title |
Electrodynamic response and local tunneling spectroscopy of strongly disordered superconducting TiN films |
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Journal Article |
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2013 |
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Phys. Rev. B |
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88 |
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18 |
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180505 (1 to 5) |
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strongly disordered superconducting TiN films, microwave resonators |
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We have studied the electrodynamic response of strongly disordered superconducting TiN films using microwave resonators, where the disordered superconductor is the resonating element in a high-quality superconducting environment of NbTiN. We describe the response assuming an effective pair-breaking mechanism modifying the density of states and compare this to local tunneling spectra obtained using scanning tunneling spectroscopy. For the least disordered film (kFl=8.7, Rs=13Ω), we find good agreement, whereas for the most disordered film (kFl=0.82, Rs=4.3kΩ), there is a strong discrepancy, which signals the breakdown of a model based on uniform properties. |
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1069 |
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Ciulin, V.; Carter, S. G.; Sherwin, M. S. |
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Terahertz optical mixing in biased GaAs single quantum wells |
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Journal Article |
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2004 |
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Phys. Rev. B |
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Phys. Rev. B |
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70 |
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11 |
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115312-(1-6) |
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optical mixing |
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1098-0121 |
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Su, M. Y.; Carter, S. G.; Sherwin, M. S. |
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Strong-field terahertz optical mixing in excitons |
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2003 |
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Phys. Rev. B |
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Phys. Rev. B |
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67 |
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12 |
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optical mixing |
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Smolyaninov, I. I.; Zayats, A. V.; Stanishevsky, A.; Davis, C. C. |
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Optical control of photon tunneling through an array of nanometer-scale cylindrical channels |
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Journal Article |
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2002 |
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Phys. Rev. B |
Abbreviated Journal |
Phys. Rev. B |
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66 |
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20 |
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205414_1-205414_5 |
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optical mixing |
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