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  1. No Access

    Article

    Precessing Vortex Motion and Instability in a Rotating Column of Superfluid 3He-B

    In a rotating circular cylinder of superfluid 3He-B, an evolving vortex expands longitudinally such that its end point describes a helically spiralling trajectory along the cylinder wall. The spiral motion is fou...

    R. Hänninen, V. B. Eltsov, A. P. Finne, R. de Graaf… in Journal of Low Temperature Physics (2009)

  2. Article

    Relic topological defects from brane annihilation simulated in superfluid 3He

    Although it is widely accepted that to resolve the ‘horizon’ problem the early Universe must have undergone a sudden expansion (cosmic inflation), what mechanism drove this process is less clear. In the branew...

    D. I. Bradley, S. N. Fisher, A. M. Guénault, R. P. Haley, J. Kopu… in Nature Physics (2008)

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    Article

    The AB Interface in Superfluid 3He as a Simulated Cosmological Brane

    We present measurements of the transport of superfluid 3He quasiparticle excitations in the ballistic limit at temperatures well below T c , and an inte...

    D. I. Bradley, S. N. Fisher, A. M. Guénault… in Journal of Low Temperature Physics (2007)

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    Article

    Symmetries of Pairing Correlations in Superconductor–Ferromagnet Nanostructures

    Using selection rules imposed by the Pauli principle, we classify pairing correlations according to their symmetry properties with respect to spin, momentum, and energy. We observe that inhomogeneity always le...

    M. Eschrig, T. Löfwander, T. Champel, J. C. Cuevas… in Journal of Low Temperature Physics (2007)

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    Article

    Kelvin-Helmholtz instability in anisotropic superfluids

    Motivated by recent theoretical and experimental interest in the subject, we derive the condition of interfacial Kelvin-Helmholtz instability for a system of two flowing superfluids (one sliding on the other)....

    T. Ruokola, J. Kopu in Journal of Experimental and Theoretical Physics Letters (2005)

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    Chapter

    Singlet-Triplet Mixing in Superconductor-­Ferromagnet Hybrid Devices

    We develop a theory which describes hybrid structures consisting out of superconducting and ferromagnetic parts. We give two examples for applications. First, we consider a hybrid structure containing ...

    Matthias Eschrig, J. Kopu, A. Konstandin, J.C. Cuevas… in Advances in Solid State Physics (2004)

  7. No Access

    Article

    Soliton-Limited Superflow in 3He-A Between Parallel Plates

    We have studied theoretically the flow of superfluid 3 He-A in parallel-plate geometry. The equilibrium order-parameter texture is calculated numerically in two spatial dimensio...

    J. Kopu, E. V. Thuneberg in Journal of Low Temperature Physics (2001)

  8. No Access

    Article

    NMR Line Shape of Rotating 3He-B at Large Counterflow Velocity

    We have investigated the NMR line shapes of superfluid 3He-B in a rotating cylinder. In the vortex-free state at sufficiently large angular velocity of rotation, Ω≳1 rad/s, the main feature of the absorption spec...

    J. Kopu, R. Schanen, R. Blaauwgeers, V. B. Eltsov… in Journal of Low Temperature Physics (2000)

  9. No Access

    Article

    Critical velocity of continuous vortex formation in rotating3He-A

    Vortex lines with continuous (singularity-free) core structure are usually formed when superfluid3He-A is accelerated to rotation. The critical counterflow velocityv c (T), at whic...

    V. M. Ruutu, J. Kopu, M. Krusius, Ü. Parts, B. Plaçais… in Czechoslovak Journal of Physics (1996)