Journal ArticleDOI
Photoresponses of granular (Pb)BiSrCaCuO films to millimeter wavelength radiation
L. Ngo Phong,I. Shih +1 more
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In this paper, the photoresponses of Pb doped 2223 phase BiSrCaCuO films to low power 5 mm cw radiation were measured at temperatures near Tc.Abstract:
The photoresponses of Pb doped 2223 phase BiSrCaCuO films to low power 5 mm cw radiation were measured at temperatures near Tc. To identify the involved detection mechanisms, dependence of responsivity on temperature, supplied current, radiation power, and film granularity were investigated. At temperatures in the vicinity of the transition to the normal state, good agreement was obtained with the responses derived from a bolometric model. At temperatures below the transition, a nonbolometric response mode was found to occur when the film was biased into a partially resistive regime. Transient measurements were carried out showing a response time for this mode of at least 5 orders of magnitude smaller than that of the bolometric response. Further characteristics inherent to the nonbolometric mode include square law detection, nonlinear current dependence, and short wavelength cutoff. In addition, a correlation between responsivity and film granularity was established. For strongly granular films with an a...read more
Citations
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INFRARED DETECTION BY TI-Ba-Ca-Cu-O SUPERCONDUCTING FILMS
TL;DR: In this article, a very promising application of high temperature superconductors is the use of these materials as broadband optical and infrared detectors, which is the case of photovoltaic voltage signals due to a Nernst effect.
Journal ArticleDOI
Square-law Josephson detection of far-infrared radiation with current-biased granular Tl2Ba2CaCu2O8 thin films
TL;DR: The far-infrared photoresponse of granular thin film Tl2Ba2CaCu2O8 has been investigated at relatively low optical powers obtained from a c.w. laser source as discussed by the authors.
Journal ArticleDOI
Response of superconducting Y–Ba–Cu–O films to millimeter wave radiation
TL;DR: In this paper, the origin of temperature and radiation power response dependencies to millimeter wave radiation was analyzed for Y-Ba-Cu-O thin films and the results indicated that the peak shape of temperature dependence for the nonbolometric response is determined by the temperature of the thermostat and is less inertial than for τ = 1/f (f=35 GHz).
Journal ArticleDOI
Response of high-temperature superconductors to electromagnetic radiation: (A Review)
A. V. Velichko,N. T. Cherpak +1 more
TL;DR: In this paper, nonequilibrium processes resulting from the interaction of high-temperature superconductors with electromagnetic radiation are considered from microwave to optical range, and the dependence of surface or dc resistance on external parameters (temperature, bias current, modulation frequency, magnetic field, radiation power, and frequency) is considered.
Journal ArticleDOI
Nonequilibrium photoresponse of YBa2Cu3O7−x granular films to 8 mm microwave radiation
TL;DR: In this paper, nonequilibrium photoresponse behavior has been investigated for YBa2Cu3O7−x (YBCO) granular films to 8 mm microwave radiation under various bias currents and magnetic fields.
References
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Book
Antenna theory and design
TL;DR: The CEM for Antennas: Finite Difference Time Domain Method (FDTDM) as mentioned in this paper is a CEM-based method for measuring the time domain of an antenna.
Book
Physics and applications of the Josephson effect
TL;DR: In this paper, the authors describe the properties of weak superconductivity and weak weak link structures, including the Josephson effect, and their application in superconducting Loops.
Journal ArticleDOI
Resistive transition in superconducting films
Abstract: The consequences of a vortex unbinding picture of two-dimensional superconductivity are worked out. Although there is no true finite-temperature phase transition, dirty superconducting films should display anomalous behavior below the BCS transition temperature and above an effective Kosterlitz-Thouless vortex unbinding temperature. In particular, both the conductivity and fluctuation diamagnetism behave like ξ
+
2
in this regime, where ξ+ is the correlation length calculated by Kosterlitz, ξ+-ξ
c
exp (B/T − T
c)1/2. We estimate ξc, B, and the vortex unbinding temperature, and determine the nonlinear resistivity below T
c. A recent theory of vortex dynamics, together with a time-dependent Ginzburg-Landau theory, lead to a determination of the frequency-dependent conductivity.
BookDOI
Earlier and recent aspects of superconductivity
J. G. Bednorz,K. A. Mùller +1 more
TL;DR: In this article, the highlights of superconductivity research in the twentieth century are reviewed and the basic phenomena resulting from the macroscopic quantum state of supercondivity (such as zero resistivity, the Meissner-Ochsenfeld effect, and flux quantization) and possible mechanisms, including the classical BCS theory and the more recent alternative theories.
Journal ArticleDOI
Optical detection in thin granular films of Y‐Ba‐Cu‐O at temperatures between 4.2 and 100 K
TL;DR: In this article, it was demonstrated that granular films of Y•Ba•Cu•O may serve as optical detectors, operating at wavelengths from the visible to the far infrared, at temperatures well above that of liquid helium.