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SUMMARY:High pressure study of a quasi one dimensional two band conductor 
 - Neven Barisic\, Stanford University
DTSTART:20061206T111500Z
DTEND:20061206T121500Z
UID:TALK5971@talks.cam.ac.uk
CONTACT:Michael Sutherland
DESCRIPTION:Quasi one-dimensional (Q1d) systems are strongly\ncorrelated m
 aterials exhibiting some of the most fasci-\nnating phenomena in condensed
  matter physics\, scal-\ning from commensurate/incommensurate spin/charge 
 or-\nders/waves to singlet/triplet superconductivities. The\nbuilding bloc
 ks of these materials are chains of atoms\nor (planar) molecules (case of 
 organic conductors) with\nlarge orbital overlaps along a favored direction
  result-\ning in a broad partially filled electronic band. The rich physic
 al properties arising from the weak interactions enhanced by the low dimen
 sionality of the band have been thoroughly investigated over the last 4 de
 cades resulting in deep understanding of the underlying physics. \n\nAn ap
 pealing way of putting new elements into the problem is by crossing the br
 oad Q1d band by a partially filled narrow band. If the interactions are we
 ak with respect to the broad band but strong with respect to the narrow ba
 nd\, a whole new field of physical varieties results from the fine interpl
 ay between the two sets of electrons. We will demonstrate that the BaVS3 f
 amily of materials is ideally suited for studying such a complex array of 
 physical properties. It is a Q1d system consisting of V-3d1 chains\, which
  displays a unique collection of correlation-driven phenomena\, including 
 a metal-\ninsulator transition driven by the charge-density wave\nand/or t
 he spin-density wave as well as a pressure-\ndependent crossover between t
 he non-Fermi-liquid and\nFermi-liquid behaviors. In an attempt to understa
 nd better these and many other properties\, we have undertaken\na systemat
 ic experimental study of BaVS3 and related\ncompounds. The primary measure
 ments carried out were\nthose of the transport properties\, resistivity an
 d thermo-electric power (TEP) as functions of temperature (from 2 to 600 K
 )\, pressure (up to 3 GPa) and magnetic field (up to 12 T). In addition to
  the transport measurements\, the strong changes in the electrical and mag
 netic properties of the system around TMI were followed by magnetic suscep
 tibility\, angle-resolved photoelectron spectroscopy (ARPES) and frequency
 -dependent conductivity. As a result we are suggesting a p-T phase diagram
 . Observed physical properties are interpreted in the framework of the two
  band model i.e. by the subtle interplay between the two sets of electrons
 .\n
LOCATION:Mott Seminar Room\, Cavendish Laboratory\, Department of Physics
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