Subject: [Depfis] CLUB DE MATERIA CONDENSADA HOY 13.30

From: Gustavo S Lozano <[email-masked]>
Date: Fri, 23 May 2008 11:02:24 -0300

CLUB DE MATERIA CONDENSADA

Seguimos con el club el VIERNES 23 a las 13.30 en el aula de seminario.

Victoria Bekeris, comentara

Superconducting Vortices in CeCoIn5: Toward the Pauli-Limiting Field
Volume 319(5860), 11 January 2008, pp 177-180

Many superconducting materials allow the penetration of magnetic  
fields in a mixed state
in which the superfluid is threaded by a regular lattice of Abrikosov  
vortices, each
carrying one quantum of magnetic flux. The phenomenological  
Ginzburg-Landau theory, based
on the concept of characteristic length scales, has generally provided  
a good description
of the Abrikosov vortex lattice state. We conducted neutron-scattering  
measurements of
the vortex lattice form factor in the heavy-fermion superconductor  
cerium-cobalt-indium
(CeCoIn5) and found that this form factor increases with increasing  
field-opposite to the
expectations within the Abrikosov-Ginzburg-Landau paradigm. We propose  
that the anomalous
field dependence of the form factor arises from Pauli paramagnetic  
effects around the
vortex cores and from the proximity of the superconducting state to a  
quantum critical
point.
http://www.sciencemag.org/cgi/reprint/319/5860/177.pdf

Tambien, Gabriela Pasquini tiene observaciones para hacer relativas al  
utlimo paper
comentado por Liliana Arrachea.

TODOS CORDIALEMENTE INVITADOS.
PROPUESTAS PARA NUEVAS LECTURAS SON BIENVENIDAS

Gustavo S Lozano
Depto de Fisica, FCEyN,UBA
PAB I Ciudad Universitaria
1428 Buenos Aires
Argentina
Phone  0054-11-4576 3390 (ext 816)
Phone 0054-11-4576 3353 (Physics Dept)
Fax   0054-11-4576 33577