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Condensed Matter
Materials Physics
Research in materials physics is organized around the theme ‘new
physics through new materials’. An historical and continuing emphasis
is the discovery of new phenomena in strongly correlated electron materials,
particularly heavy-fermion systems in which electronic correlations enhance
the effective mass of charge carriers to as much as 1000 times the mass
of a free electron. New materials are prepared by conventional arc melting
and powder metallurgical techniques but most often are grown as single
crystals out of excess flux. Discovering new physics requires a breadth
of experimental approaches to probe spin, charge and lattice degrees-of-freedom
on multiple length and time scales and frequently at extremes of very
low temperatures, high magnetic fields and high pressures. Our research
also takes advantage of special capabilities within the group, for example,
ultrafast optical spectroscopy, within the laboratory, the National High
Magnetic Field Laboratory, the Manuel Lujan Neutron Scattering Center
and facilities to prepare transuranic crystals, as well as national and
international facilities, including neutron scattering and muon sources,
and an extensive set of international collaborators.
Broadly, the materials physics effort is composed of three interconnected
efforts: materials preparation/crystal growth, thermodynamic and transport
measurements and spectroscopies. The principal staff members and their
primary techniques are given below.
| Materials Preparation Crystal Growth |
Thermodynamic & Transport Measurements |
Spectroscopies |
| John Sarrao - Intermetallics, oxides,
transuranics. |
Michael Hundley - Resistivity, specific heat, thermopower,
Hall effect, thermal expansion, and magneto-striction; T > 1.5
K, H < 12 T |
Wei Bao - Elastic and inelastic neutron scattering;
T>0.05K, H<18T, P>0
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| Zachary Fisk* |
Roman Movshovich - Specific heat, thermal conductivity
and resistivity; T > 0.03 K, H < 20 T, P > 0. |
Nicholas Curro - Nuclear magnetic and quadrapole
resonance; P > 0 |
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Joe Thompson - DC susceptibility, resistivity; P
> 0, T > 0.3 K |
Robert Heffner - Muon spin resonance, local structure
by neutron scattering; P > 0 |
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John Joyce- Photoemission, Laser
Plasma Light Source |
*Long term collaborator
This activity, like others in the group, benefits from active participation
of several postdoctoral fellows, typically one or two per staff member,
as well as long term visitors, particularly Zachary Fisk and members of
the Institute for High Pressure Physics in Troitsk, Russia.
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