Subject: [Depfis] Seminario-E.Fradkin

From: gustavo lozano <[email-masked]>
Date: Tue, 18 Aug 2009 12:51:28 -0300

SEMINARIO

                                        EDUARDO FRADKIN

                                      Univ Illionois at Urbana

                                    JUEVES 20 11hs AULA SEMINARIO

La notable fase superconductora del superconductor de alta temperatura
La$_{2-x}$Ba$_x$CuO$_4$

In the stripe-ordered state of a strongly correlated two-dimensional
electronic system, under a set of special
circumstances, the superconducting condensate, like the magnetic order, can
occur at a nonzero wave vector
corresponding to a spatial period double that of the charge order. In this
case, the Josephson coupling between near
neighbor planes, especially in a crystal with the special structure of
La$_{2-x}$Ba$_x$CuO$_4$, vanishes identically.
We propose that this is the underlying cause of the dynamical decoupling of
the layers recently observed in transport
measurements at $x =1/8$ in this cuprate superconductor. We will discuss the
phenomenological consequences of this
 hypothesis as well as the possible microscopic mechanisms for this
interesting state.

-- 
Gustavo S Lozano
Profesor Asociado
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 3357
Mobile  0054-9-11-6829 6829 (from abroad)
           011-15-6829 6829 (from Argentina)
SKYPE   gustavo.s.lozano