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Author |
Gershenzon, E. M.; Gol'tsman, G. N.; Semenov, A. D. |
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Title |
Submillimeter backward wave tube spectrometer for measuring superconducting film transmission |
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Journal Article |
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Year |
1983 |
Publication |
Pribory i Tekhnika Eksperimenta |
Abbreviated Journal |
Pribory i Tekhnika Eksperimenta |
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26 |
Issue |
5 |
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134-137 |
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Keywords |
BWO spectroscopy, spectrometer, transmission |
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Abstract |
A spectrometer employing six backward wave tubes is described. It is intended for investigation of superconductors in the 0.2-3 mm range of wave lengths. During the measurement of the transmission spectrum it is possible to determine the energy gap for superconduct1ng films 50 to 4000 A thick. The transmission factor can vary from 10-1 to 10-9. Spectrum of relation of film transmission factors in superconducting and normal states is measured for determining the energy gap 2 Δ. The transmission spectrum obtained by means of a computer for vanadium film 300 A thick is given as an example. The energy gap 2 Δ = 1.4 MeV |
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Russian |
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0032-8162 |
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Субмиллиметровый спектрометр с лампами обратной волны для измерения пропускания сверхпроводниковых пленок |
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1713 |
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Shytov, A. V.; Levitov, L. S.; Beenakker, C. W. J. |
![goto web page (via DOI) doi](img/doi.gif)
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Title |
Electromechanical noise in a diffusive conductor |
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Journal Article |
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Year |
2002 |
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Phys. Rev. Lett. |
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Phys. Rev. Lett. |
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Volume |
88 |
Issue |
22 |
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Electrons moving in a conductor can transfer momentum to the lattice via collisions with impurities and boundaries, giving rise to a fluctuating mechanical stress tensor. The root-mean-squared momentum transfer per scattering event in a disordered metal (of dimension L greater than the mean free path l and screening length xi) is found to be reduced below the Fermi momentum by a factor of order l/L for shear fluctuations and (xi/L)^2 for pressure fluctuations. The excitation of an elastic bending mode by the shear fluctuations is estimated to fall within current experimental sensitivity for a nanomechanical oscillator. |
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0031-9007 |
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RPLAB @ s @ |
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433 |
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Beck, M.; Rousseau, I.; Klammer, M.; Leiderer, P.; Mittendorff, M.; Winnerl, S.; Helm, M.; Gol'tsman, G.N.; Demsar, J. |
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Title |
Transient increase of the energy gap of superconducting NbN thin films excited by resonant narrow-band terahertz pulses |
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Journal Article |
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2013 |
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Phys. Rev. Lett. |
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Phys. Rev. Lett. |
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110 |
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26 |
Pages |
267003 (1 to 5) |
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Keywords |
NbN thin films, energy gap |
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Observations of radiation-enhanced superconductivity have thus far been limited to a few type-I superconductors (Al, Sn) excited at frequencies between the inelastic scattering rate and the superconducting gap frequency 2Delta/h. Utilizing intense, narrow-band, picosecond, terahertz pulses, tuned to just below and above 2Delta/h of a BCS superconductor NbN, we demonstrate that the superconducting gap can be transiently increased also in a type-II dirty-limit superconductor. The effect is particularly pronounced at higher temperatures and is attributed to radiation induced nonthermal electron distribution persisting on a 100 ps time scale. |
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Department of Physics and Center for Applied Photonics, University of Konstanz, D-78457, Germany |
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0031-9007 |
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PMID:23848912 |
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1370 |
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Li, Mo; Pernice, W. H. P.; Xiong, C.; Baehr-Jones, T.; Hochberg, M.; Tang, H. X. |
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Title |
Harnessing optical forces in integrated photonic circuits |
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Journal Article |
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Year |
2008 |
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Nature |
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Nature |
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456 |
Issue |
7221 |
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480-484 |
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0028-0836 |
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RPLAB @ s @ |
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425 |
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Author |
Taylor, F.W. |
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Title |
Atmospheric physics: Natural lasers on Venus and Mars |
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Year |
1983 |
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Nature |
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Nature |
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306 |
Issue |
5944 |
Pages |
640-640 |
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0028-0836 |
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457 |
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