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Phys. Rev. Lett. 96, 017403 (2006) [4 pages]

Heavy Fermion Fluid in High Magnetic Fields: An Infrared Study of CeRu4Sb12

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S. V. Dordevic1,*,†, K. S. D. Beach2, N. Takeda3, Y. J. Wang4, M. B. Maple1, and D. N. Basov1
1Department of Physics, University of California, San Diego, La Jolla, California 92093, USA
2Department of Physics, Boston University, Boston, Massachusetts 02215, USA
3Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwa, Chiba 277-8581, Japan
4National High Magnetic Field Laboratory, Tallahassee, Florida 32310, USA

Received 30 May 2004; published 9 January 2006

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*≃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.

© 2006 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.96.017403
DOI:
10.1103/PhysRevLett.96.017403
PACS:
78.30.Er, 71.27.+a, 72.15.Jf, 75.20.Hr

*Present address: Department of Physics, The University of Akron, Akron, OH 44325, USA.

†Electronic address: sasha@physics.uakron.edu

 
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