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Condensed Matter Colloquium Thursday, September 29, 2011

Summary: Condensed Matter Colloquium
Thursday, September 29, 2011
2 pm, Room 1201
Refreshments at 1:30 pm in Room 1305F
Jean-Philippe Reid
Université de Sherbrooke, Canada
Probing exotic ground states with thermal conductivity
Thermal conductivity is a powerful technique to probe any quantum materials. As an
example, for a superconductor, the only non-zero transport measurement in the
superconducting state is the thermal conductivity, which gives access to the
underlying physics of this phase. In this talk, I will present two projects on heavy
fermion and iron-based superconductors materials probed by thermal conductivity.
For the heavy fermion YbRh2Si2 [1] and CeCoIn5 [2], we were able to study the
physical properties near the quantum critical point (QCP) of these materials. For the
iron-based superconductors, by using thermal conductivity as a directional probe of
the superconducting gap structure, we were able to get insight on the pairing
mechanism of the materials K-Ba122 [3,4], Co-Ba122 [5,6], LiFeAs [7] and FeSeTe
[8]. Indeed, we observed a general trend for the evolution of the superconducting
gap with doping. At optimal doping, the gap structure is nodeless and isotropic (3D).
Away from optimal doping, nodes appear on the Fermi surface at the edges of the


Source: Appelbaum, Ian - Department of Physics, University of Maryland at College Park


Collections: Engineering; Materials Science