Observing the anisotropic optical response of the heavy-fermion compound UNi2Al3

Details Observing the anisotropic optical response of the heavy-fermion compound UNi2Al3 Observing the anisotropic optical response of the heavy-fermion compound UNi2Al3

2009-10-28

arxiv.org/abs/0910.5345v1

Physics

Condensed Matter

Strongly Correlated Electrons

3 pages, 2 figures, accepted for proceedings of QCnP 2009

Scientific paper

10.1002/pssb.200983030

The optical conductivity of heavy fermions can reveal fundamental properties of the charge carrier dynamics in these strongly correlated electron systems. Here we extend the conventional techniques of infrared optics on heavy fermions by measuring the transmission and phase shift of THz radiation that passes through a thin film of UNi2Al3, a material with hexagonal crystal structure. We deduce the optical conductivity in a previously not accessible frequency range, and furthermore we resolve the anisotropy of the optical response (parallel and perpendicular to the hexagonal planes). At frequencies around 7cm^-1, we find a strongly temperature-dependent and anisotropic optical conductivity that - surprisingly - roughly follows the dc behavior.

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