Concept
Superfluidité
Publications associées (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 Society2014Obstacle-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 ...
Springer2014Anderson Tower of States and Nematic Order of Spin-1 Bosonic Atoms on a 2D Lattice
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 ...
2014Nucleation 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 Physics2014Anisotropic 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 Group2014Critical Current Oscillations in the Intrinsic Hybrid Vortex State of SmFeAs(O,F)
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) ...
2014Superfluidity with disorder in a thin film of quantum gas
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