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  • 1
    Electronic Resource
    Electronic Resource
    Quasioptical superconducting hot electron bolometer for submillmeter waves (1996)
    Springer
    International journal of infrared and millimeter waves 17 (1996), S. 317-331 
    Details
    ISSN: 1572-9559
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report on a superconducting hot electron bolometer coupled to radiation via a broadband antenna. The bolometer, a structured NbN film, was patterned on a thin dielectric membrane between terminals of a gold slotline antenna. We investigated the response to submillimeter radiation (wave-lengths ∼ 0.1 mm to 0.7 mm) in the fundamental Gaussian mode. We found that the directivity of the antenna was constant within a factor of 2.5 through the whole experimental range. The noise equivalent power of the bolometer at 119 µm was ∼ 3 · 10−13 W/Hz1/2; a time constant of ∼ 160 ps was estimated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02088154
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Studies of the residual absorption of a Bi2Sr2CaCu2O8+δ single crystal at THz frequencies (1996)
    Springer
    Journal of low temperature physics 105 (1996), S. 785-790 
    Details
    ISSN: 1573-7357
    Keywords: 74.25.Gz optical properties ; 74.72.Hs Bi-based compounds
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We measured the residual absorption of a Bi2Sr2 CaCu2 O8+δ single crystal at low temperature in the frequency range between 0.6 THz and 4.2 THz using a new method, photothermal interference spectroscopy. By combining with reflectivity data obtained with a Fourier-transform IR spectrometer (frequency range: 3 THz to 100 THz) we have calculated the dynamical conductivity using a Kramers-Kronig-transformation. The results are compared with calculations of the far infrared conductivity and show qualitative features expected for a superconductor with nodes in the gap.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00768479
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Static and dynamic forces on a permanent magnet levitating between superconducting surfaces (1993)
    Springer
    Journal of low temperature physics 93 (1993), S. 85-100 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A charged magnetic microsphere (radius 100 µm) is levitating inside a superconducting niobium capacitor. Because of its charge of about 1 pC, oscillations about the equilibrium position can be excited and detected electrically. The properties of this oscillator are investigated in order to study the static and dynamic forces of magnetic levitation. We find resonance frequencies between 200 Hz and 600 Hz. The resonance frequency and the damping are amplitude dependent due to nonlinear return forces and nonlinear friction, respectively. At small amplitudes the Q value is about 106 in vacuum. A dc field can be applied to change the equilibrium position and consequently the resonance frequency. From the data the spatial dependence of the static force and of the dynamic stiffness can be determined and an empirical relation between both is established. Quite often, we find a hysteretic behavior of the static force whereas the stiffness is a reversible function of the position. Amplitude dependent damping is observed both in the decay of the free oscillations and in the dependence of the amplitude of the forced oscillations on the driving force.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00682282
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    Paper (German National Licenses)
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