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Condensed Matter Seminars
Condensed Matter
Wednesday, January 30, 2002
3:00 PM
Physics Building, Room 204
Note special date.
Note special time.
Note special room.

Eugene Pivovarov
[Host: P. Fendley]
Caltech
"Nonconventional metals: oddfrequency density waves and ddensity wave"

ABSTRACT:
We discuss the metallic states which are ordered and therefore are not
convetional Fermi liquids. In oddfrequency density waves the order
parameter vanishes at zero frequency and there is a conventional Fermi
surface. However, the frequency dependence of the gap leads to an
unusual temperature dependence for various thermodynamic and transport
properties. The ddensity wave (DDW) is a candidate for the explanation
of the pseudogap phase in superconducting cuprates. The gap vanishes at
the nodal points, which causes the pure DDW state to be metallic.
However, DDW can coexist with either antiferromagnetic or
superconducting phases. We consider a microscopic model which favors DDW
and do the meanfieldtheoretical derivation of the phase diagram (this
work is in progress). 



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