Heavy fermion fluid in high magnetic fields: an infrared study of CeRu4Sb12
We report a comprehensive infrared magnetospectroscopy study of a CeRu4Sb1212 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*≃70 mb (mb 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.
@article{
title = {Heavy Fermion Fluid in High Magnetic Fields: An Infrared Study of CeRu$_4$Sb$_{12}$},
author = {Dordevic, S. V. and Beach, K. S. D. and Takeda, N. and Wang, Y. J. and Maple, M. B. and Basov, D. N.},
journal = {Physical Review Letters},
volume = {96},
issue = {1},
pages = {017403},
numpages = {4},
year = {2006},
month = {Jan},
publisher = {American Physical Society},
doi = {10.1103/PhysRevLett.96.017403},
url = {https://link.aps.org/doi/10.1103/PhysRevLett.96.017403}
}