Concept

Superfluidity

Related publications (76)

Magnetic field dependence of the basal-plane superconducting anisotropy in YBa2Cu4O8 from small-angle neutron scattering measurements of the vortex lattice

We report a study of the basal-plane anisotropy of the superfluid density in underdoped YBa2Cu4O8 (Y124), showing the effects of both the CuO2 planes and the fully occupied CuO chains. From small-angle neutron scattering measurements of the vortex lattice, ...

American Physical Society2014

Obstacle-induced spiral vortex breakdown

Mohamed Farhat, François Gallaire, Matthieu Dreyer, Simon Pasche

An experimental investigation on vortex breakdown dynamics is performed. An adverse pressure gradient is created along the axis of a wing-tip vortex by introducing a sphere downstream of an elliptical hydrofoil. The instrumentation involves high-speed visu ...

Springer2014

Anderson Tower of States and Nematic Order of Spin-1 Bosonic Atoms on a 2D Lattice

Frédéric Mila, Hongyu Yang

We investigate the structure of the spectrum of antiferromagnetically coupled spin-1 bosons on a square lattice using degenerate perturbation theory and exact diagonalizations of finite clusters. We show that the superfluid phase develops an Anderson tower ...

2014

Nucleation of quantized vortex rings in 4He nanodroplets

Marcel Drabbels, Xiaohang Zhang

Whereas most of the phenomena associated with superfluidity have been observed in finite-size helium systems, the nucleation of quantized vortices has proven elusive. Here we show that the solvation of a Ba+ ion created by photoionization of neutral Ba at ...

American Institute of Physics2014

Anisotropic softening of magnetic excitations along the nodal direction in superconducting cuprates

Henrik Moodysson Rønnow, Marco Grioni, Thorsten Schmitt, Helmuth Berger, Marco Guarise, Bastien Dalla Piazza

The high-T-c cuprate superconductors are close to antiferromagnetic order. Recent measurements of magnetic excitations have reported an intriguing similarity to the spin wavesmagnons- of the antiferromagnetic insulating parent compounds, suggesting that ma ...

Nature Publishing Group2014

Critical Current Oscillations in the Intrinsic Hybrid Vortex State of SmFeAs(O,F)

Philip Johannes Walter Moll

In layered superconductors the order parameter may be modulated within the unit cell, leading to nontrivial modifications of the vortex core if the interlayer coherence length ξc(T) is comparable to the interlayer spacing. In the iron pnictide SmFeAs(O,F) ...

2014

Conventional superconductivity and hysteretic Campbell penetration depth in single crystals MgCNi3

Sergiy Katrych

Single crystals of MgCNi3, with areas sized up to 1 mm(2), were grown by the self-flux method using a cubic anvil high-pressure technique. In low applied fields, the dc magnetization exhibited a very narrow transition into the superconducting state, demons ...

Amer Physical Soc2013

Superfluidity of spinor Bose-Einstein condensates

Hugo Pierre Alexandre Flayac

We consider a spin-1/2 Bose-Einstein condensate initially prepared in a single-spin projection. The two channels of dynamical excitations existing in such a system (density and spin waves) are discussed and we show how pure spin waves can be excited in the ...

Amer Physical Soc2013

Interacting spin-1 bosons in a two-dimensional optical lattice

We study, using quantum Monte Carlo (QMC) simulations, the ground state properties of spin-1 bosons trapped in a square optical lattice. The phase diagram is characterized by the mobility of the particles (Mott insulating or superfluid phase) and by their ...

Amer Physical Soc2013

Superfluidity with disorder in a thin film of quantum gas

Jean-Philippe Brantut

We investigate the properties of a strongly interacting superfluid gas of 6Li2 Feshbach molecules forming a thin film confined in a quasi-two-dimensional channel with a tunable random potential, creating a microscopic disorder. We measure the atomic curren ...

American Physical Society2013

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