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  • 1. Agren, P.
    et al.
    Andersson, K.
    Haviland, David B.
    KTH, Superseded Departments, Physics.
    Kinetic inductance and Coulomb blockade in one dimensional Josephson junction arrays2001In: Journal of Low Temperature Physics, ISSN 0022-2291, E-ISSN 1573-7357, Vol. 124, no 02-jan, p. 291-304Article in journal (Refereed)
    Abstract [en]

    One dimensional Josephson junction arrays have been fabricated and current-voltage characteristics (IVC) have been measured at cryogenic temperatures. The arrays were fabricated in a SQUID-geometry which allowed an in. situ tuning of thc Josephson energy by application of a magnetic field. The IVC of thc arrays shows a clear Coulomb blockade state. In the Coulomb blockade regime the IVC are hysteretic, The array is modeled using a Serial resistive-inductive-junction model which is able to qualitatively explain the IVC. In this model an inductance of the order of 0.1-10 mH per Junction is needed to account for the hysteresis. Kinetic inductance. stemming from the inertia of the Cooper pairs. gives the correct order of magnitude. The problem of self-heating is also discussed as an alternative explanation of the hysteresis.

  • 2.
    Haviland, David B.
    et al.
    KTH, Superseded Departments, Physics.
    Andersson, K.
    Agren, P.
    Superconducting and insulating behavior in one-dimensional Josephson junction arrays2000In: Journal of Low Temperature Physics, ISSN 0022-2291, E-ISSN 1573-7357, Vol. 118, no 06-maj, p. 733-749Article in journal (Refereed)
    Abstract [en]

    Experiments on one-dimensional small capacitance Josephson Junction arrays are described. The arrays have a junction capacitance that is much larger than the stray capacitance of the electrodes, which we argue is important for observation of Coulomb blockade. The Josephson energy can be tuned in situ and an evolution from Josephson-like to Coulomb blockade behavior is observed. This evolution can be described as a superconducting to insulating, quantum phase transition. In the Coulomb blockade state, hysteretic current-voltage characteristics are described by a dynamic model which is dual to the resistively shunted junction model of classical Josephson junctions.

  • 3.
    Lundqvist, Björn
    et al.
    KTH, Superseded Departments, Physics.
    Rapp, Östen
    KTH, Superseded Departments, Physics.
    Johansson, L. G.
    Göteborgs Universitet.
    Chen, H .Q.
    Göteborgs Universitet.
    Ivanov, Z. G.
    Department of Physics, Chalmers University of Technology.
    Andersson, Magnus
    KTH, Superseded Departments, Physics.
    Vortex dynamics in a thin film of Tl2Ba2CuO61999In: Journal of Low Temperature Physics, ISSN 0022-2291, E-ISSN 1573-7357, Vol. 117, no 5-6, p. 1441-1445Article in journal (Refereed)
    Abstract [en]

    The vortex dynamics in a Tl2Ba2CuO6 (Tl-2201) thin film with a critical temperature T-c = 80.8 K has been studied by electrical resistivity measurements for magnetic fields 0 less than or equal to B less than or equal to 12 T. The vortex glass line, as determined from the disappearance of linear resistivity, was found to be well described by B-g (T) = B-0[(1 - T/T-c)/(T/T-c)(alpha), with B-0 approximate to 0.65 T and alpha approximate to 1.9. The glass line of Tl-2201 is observed to be located below the one of Tl2Ba2CaCu2O8+delta (Tl-2212) in a magnetic phase diagram based on a reduced temperature scale T/T-c, thus suggesting a higher anisotropy for Tl-2201.

  • 4.
    Rapp, Östen.
    et al.
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    Bjornangen, T.
    Eltsev, Y.
    Rydh, A.
    Resistivity studies by multiterminal transport measurements on single crystal YBa2Cu3O7-delta2003In: Journal of Low Temperature Physics, ISSN 0022-2291, E-ISSN 1573-7357, Vol. 131, no 06-maj, p. 1009-1018Article in journal (Refereed)
    Abstract [en]

    Multiterminal transport studies provide a powerful technique to investigate vortex structure and correlations in the vicinity of the vortex solid-to-liquid transition in single crystals of high temperature superconductors. Recent results are described, including new contact configurations, allowing both longitudinal and transverse vortex correlations to be studied in one crystal during a single temperature sweep at constant field.

  • 5.
    Rydh, Andreas
    et al.
    KTH, Superseded Departments, Physics.
    Andersson, Magnus
    KTH, Superseded Departments, Physics.
    Rapp, Östen
    KTH, Superseded Departments, Physics.
    Thermally assisted flux creep of a driven vortex lattice in untwinned YBa2Cu3O7-delta single crystals1999In: Journal of Low Temperature Physics, ISSN 0022-2291, E-ISSN 1573-7357, Vol. 117, no 5-6, p. 1335-1339Article in journal (Refereed)
    Abstract [en]

    We have studied the driven vortex lattice in untwinned, clean YBa2 Cu-3 O7-delta single crystals, showing the first order (melting) transition T-m. At high enough driving currents (j similar to 10(3) A/cm(2), j greater than or similar to j(c)) and temperatures T < T-m a clear distinction is found between two different behaviours of the moving vortex lattice. The onset of dissipation is characterized by a noisy flux creep with a temperature independent activation energy U(j). At higher temperatures, the creep regime crosses over into a flux flow regime with linear resistivity. Apart from the dip in resistivity at T-m, associated with the peak effect and usually assigned to a softening of the shear modulus, the resistivity of the flowing flux lattice continuously extends into the vortex-liquid.

  • 6.
    Silaev, Mihail A.
    KTH, School of Engineering Sciences (SCI), Theoretical Physics.
    Dissipative Vortex Motion in Fermi Superfluids at Ultra Low Temperatures2013In: Journal of Low Temperature Physics, ISSN 0022-2291, E-ISSN 1573-7357, Vol. 171, no 5-6, p. 539-550Article in journal (Refereed)
    Abstract [en]

    We discuss in detail the recently proposed mechanism of dissipation and damping of the vortex motion in Fermi superfluids at temperatures much smaller than the critical one (Silaev, Phys. Rev. Lett., 108:045303, 2012). In the absence of the heat bath of normal component the kinetic energy of the superflow is transferred to the vortex core fermions due to the accelerated vortex motion. The resulting local heating of the vortex cores creates the heat flux carried by non-equilibrium quasiparticles emitted by moving vortices. Here we study this peculiar kinetics of localized quasiparticles beyond relaxation time approximation, calculate the decrement of Kelvin waves and the total power losses in Kelvin wave cascade realized by the turbulent motion of He-3-B.

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