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  • 1
    Electronic Resource
    Electronic Resource
    Thin-film dc SQUID gradiometer using a single YBa2Cu3O7−x layer (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 65 (1994), S. 779-780 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A dc SQUID gradiometer with a large effective pickup area using only a single YBa2Cu3O7−x layer and step-edge Josephson junctions on SrTiO3 substrate has been prepared. The planar gradiometer consists of two loops coupled directly to a small area SQUID in the center of the structure. The main advantage in comparison to magnetometers is the possibility of direct measurements in a magnetically unshielded environment. At 77 K without bias reversal technique we obtain a white noise level of about 4.5×10−5 Φ0 Hz−1/2 or 8×10−13 T cm−1 Hz−1/2 down to 10 Hz. At 1 Hz noise increases up to 6×10−12 T cm−1 Hz−1/2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.112228
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  • 2
    Electronic Resource
    Electronic Resource
    Temperature dependence of the current-phase relation for YBa2Cu3O7−x step-edge Josephson junctions (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 72 (1998), S. 731-733 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The current-phase relation (CPR) of YBa2Cu3O7−x step-edge Josephson junctions was investigated experimentally at various temperatures. The investigated junctions were incorporated into a washer-shaped superconducting ring with inductance L∼300 pH. The ring was inductively coupled to a tank circuit with a resonance frequency between 9 MHz and 40 MHz. The CPR was obtained from the measurement of the impedance of the phase-biased junction. At high temperatures and low critical current the experimentally observed CPR is sinusoidal. The same results were obtained at low temperatures when the rms flux noise in the ring is negligible. In the case of larger critical current and finite noise, deviations of the apparent CPR from sinusoidal dependence were found. The deviations can be described by thermal fluctuations of the magnetic flux in the ring. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.120858
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  • 3
    Electronic Resource
    Electronic Resource
    Current resolution, noise, and inductance measurements on high-Tc dc SQUID galvanometers (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 68 (1996), S. 708-710 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Single layer autonomous high-Tc dc superconducting quantum interference devices (SQUIDs) have been fabricated and tested. The SQUIDs were designed for application as a galvanometer. The current to be measured is injected directly in a microstrip segment of the SQUID loop. Step-edge as well as bicrystal YBCO Josephson junctions were used. We consider two aspects: (i) optimization of the noise properties with respect to current resolution, and (ii) temperature dependence of the period of voltage-flux relation. The SQUID inductance was calculated numerically taking into account the magnetic field penetration depth λ. The temperature dependence of λ(T) was obtained from experimental results and is found to be in good agreement with λ(T)≈λ(0)[1−(T/TC)2]−1/2. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.116599
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  • 4
    Electronic Resource
    Electronic Resource
    Current-phase relationship of YBa2Cu3O7−x ramp-edge Josephson junctions (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 76 (2000), S. 100-102 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The current-phase relation (CPR) of high-Tc ramp-edge Josephson junctions (YBa2Cu3O7−x/PrBa2Cu3O7/YBa2Cu3O7−x) was investigated experimentally in the temperature range 65〈T〈85 K. The investigated junctions were incorporated into a washer-shaped superconducting loop with inductance L(approximate)80 pH forming a single-junction interferometer. The CPR was obtained from the measurement of the impedance of the phase-biased junction. We show that, for junctions with sufficiently small critical current Ic, the CPR is sinusoidal. In the case of larger critical current, deviations of the apparent CPR from sinusoidal dependence were found. These deviations can be described by thermal fluctuations of the magnetic flux in the loop. So we conclude that, for all investigated junctions, the "true" CPR is sinusoidal. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.125669
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  • 5
    Electronic Resource
    Electronic Resource
    Radio-frequency based monitoring of small supercurrents (2001)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 72 (2001), S. 1882-1887 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We consider the applicability of the established rf readout technique, which allows to obtain the supercurrent-phase relation of a Josephson element from impedance measurements in the phase-biased regime. In experiments on Nb-based single and double tunnel junctions, we demonstrate that this method holds even if the Josephson coupling energy is smaller than the thermal energy. Compared with conventional current–voltage measurements, we evaluate the rf technique to be favorable in particular for investigations of small supercurrents in low-capacitance Josephson elements. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1347374
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  • 6
    Electronic Resource
    Electronic Resource
    Influence of light on the magnetic moment of ceramic high-T"c superconductors and SQUIDs
    Amsterdam : Elsevier
    Journal of Magnetism and Magnetic Materials 104-107 (1992), S. 491-492 
    Details
    ISSN: 0304-8853
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0304-8853(92)90891-Q
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  • 7
    Electronic Resource
    Electronic Resource
    Inductive reply of high-Tc rf SQUID in the presence of large thermal fluctuations (1997)
    Springer
    Journal of low temperature physics 106 (1997), S. 503-508 
    Details
    ISSN: 1573-7357
    Keywords: 75.50.+r ; 85.25.Cp
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Inductive reply of the high Tc rf SQUIDs were investigated at 77 K. It is shown experimentally that the SQUIDs operate in adiabatic nonhysteretic (dispersive) mode. The SQUIDs were operable even if (i) the Josephson coupling energy is considerably smaller than the thermal energy, and (ii) the SQUID inductance is larger than the so called “fluctuation-threshold inductance”. The influence of thermal noise on the response of nonhysteretic SQUIDs is estimated theoretically. The validity limits of the estimation are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02399659
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