|
The material class CeTIn5 with (T = Co, Ir, Rh) shows a number of remarkable properties such as heavy fermion behavior, superconductivity
and quantum criticality [1]. The mechanism of
superconductivity is unresolved. Its order parameter is unconventional, i.e. has nodes. We have investigated the low-energy electronic structure
of these compounds by angle-resolved photoemission and band structure calculations. Fermi surface maps and energy distribution maps along the
high-symmetry directions are presented. We find overall agreement between experiment and theory. Furthermore we study the role of the 4f
electrons by Ce 4d-4f resonant angle-resolved photoemission and directly monitor the high effective mass band which is responsible for the heavy
fermion behavior of the compound. This band has a peculiar k-dependence which can be qualitatively explained by the Periodic Anderson Model. The
temperature dependence of the f-related features is studied and found to be consistent with transport measurements.
[1] C. Petrovic et al., J. Phys.: Condens. Matter. 13, L337, (2001) |
|