[Todos] Coloquios DF - Gaston Garbarino (ESRF), Jueves 4/12, 14hs, Aula Seminario, 2do piso, Pab. I

[Augusto Roncaglia]

COLOQUIOS DEL DEPARTAMENTO DE F�SICA FCEYN - UBA


              En el Aula Seminario, 2do piso, Pab. I,

              Jueves 4/12, 14hs:

              GASTON GARBARINO

              European Synchrotron Radiation Facility


*              Multiple polyamorphisms and superconductivity in Ce-based
metallic glasses*


Metallic glasses are in the cutting edge of research in materials science
for both their unique properties that yield a variety of commercial
applications like micro-electromechanical systems, pressure sensors or
biocompatible prosthesis and for fundamental studies on the nature of the
glass transition and other related phenomena. In this presentation we will
present coupled high pressure diffraction, inelastic X ray scattering and
resistivity measurements on the Ce70Al10Ni10Cu10 alloy. In this system a
series of pressure induced polyamorphic transformations have been observed
and the differences in the transport properties of the different amorphous
phases are discussed and correlated to their microstructure. Especially we
will concentrate in the low temperature behaviour of the transport
properties where we observe a minimum of the resistivity associated with
the Kondo effect. Application of hydrostatic pressure induces a reduction
of the temperature where this minimum is observed, the disappearance of the
Kondo behaviour and the appearance of superconductivity. We will discuss
and analyze the correlation of the polyamorphic transitions with the
anomalies in the transport properties.
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