Heavy fermion fluid in high magnetic fields: an infrared study of CeRu4Sb12.
We report a comprehensive infrared magnetospectroscopy study of a CeRu4Sb12 compound revealing quasiparticles with a heavy effective mass m*, with a detailed analysis of optical constants in fields up to 17 T. We find that the applied magnetic field strongly affects the low-energy excitations in the system. In particular, the magnitude of m* approximately = 70 m(b) (m(b) is the quasiparticle band mass) at 10 K is suppressed by as much as 25% at 17 T. This effect is in quantitative agreement with the mean-field solution of the periodic Anderson model augmented with a Zeeman term.
Dordevic
S V
SV
Department of Physics, University of California, San Diego, La Jolla, California 92093, USA. sasha@physics.uakron.edu
Beach
K S D
KS
Takeda
N
N
Wang
Y J
YJ
Maple
M B
MB
Basov
D N
DN