459 research outputs found
Vortices and charge order in high-T_c superconductors
We theoretically investigate the vortex state of the cuprate high-temperature
superconductors in the presence of magnetic fields. Assuming the recently
derived nonlinear -model for fluctuations in the pseudogap phase, we
find that the vortex cores consist of two crossed regions of elliptic shape, in
which a static charge order emerges. Charge density wave order manifests itself
as satellites to the ordinary Bragg peaks directed along the axes of the
reciprocal copper lattice. Quadrupole density wave (bond order) satellites, if
seen, are predicted to be along the diagonals. The intensity of the satellites
should grow linearly with the magnetic field, in agreement with the result of
recent experiments
3D Modulated Spin Liquid model applied to URuSi
We have developed a 3D version for the Modulated Spin Liquid in a
body-centered tetragonal lattice structure to describe the hidden order
observed in URuSi at K. This second order transition
is well described by our model confirming our earlier hypothesis. The symmetry
of the modulation is minimized for . We assume a linear
variation of the interaction parameters with the lattice spacing and our
results show good agreement with uniaxial and pressure experiments.Comment: 5 pages, 4 figure
Charge orders, magnetism and pairings in the cuprate superconductors
We review the recent developments in the field of cuprate superconductors
with the special focus on the recently observed charge order in the underdoped
compounds. We introduce new theoretical developments following the study of the
antiferromagnetic (AF) quantum critical point (QCP) in two dimensions, in which
preemptive orders in the charge and superconducting (SC) sectors emerged, that
are in turn related by an SU(2) symmetry. We consider the implications of this
proliferation of orders in the underdoped region, and provide a study of the
type of fluctuations which characterize the SU(2) symmetry. We identify an
intermediate energy scale where the SU(2) pairing fluctuations are dominant and
argue that they are unstable towards the formation of a Resonant Peierls
Excitonic (RPE) state at the pseudogap (PG) temperature . We discuss the
implications of this scenario for a few key experiments.Comment: 16 pages, 17 figure
Reply to the Comment by Galanakis \textit{et al} on the paper \textquotedblleft Exact bosonization for an interacting Fermi gas in arbitrary dimensions"
It is shown that the criticism presented in the Comment by Galanakis et al
\cite{1} on the paper by Efetov et al \cite{2} is irrelevant to the
bosonization approach.Comment: 2 pages, no figure
The modulated spin liquid: a new paradigm for URuSi
We argue that near a Kondo breakdown critical point, a spin liquid with
spatial modulations can form. Unlike its uniform counterpart, we find that this
occurs via a second order phase transition. The amount of entropy quenched when
ordering is of the same magnitude as for an antiferromagnet. Moreover, the two
states are competitive, and at low temperatures are separated by a first order
phase transition. The modulated spin liquid we find breaks symmetry, as
recently seen in the hidden order phase of URuSi. Based on this, we
suggest that the modulated spin liquid is a viable candidate for this unique
phase of matter.Comment: 4 pages, 2 figure
ATI "Evolution Climatique et Santé" : 2ème rapport d'étape UMR 144 LISAH (ex UR 96 AMBRE) : année 2005
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