J. Phys. Soc. Jpn. 83, 061007 (2014) [8 Pages]
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SPECIAL TOPICS: Advances in Physics of Strongly Correlated Electron Systems

Composite Orders and Lifshitz Transition of Heavy Electrons

Yoshio Kuramoto1, and Shintaro Hoshino2
+ Affiliations
1Department of Physics, Tohoku University, Sendai 980-8578, Japan2Department of Basic Science, The University of Tokyo, Meguro, Tokyo 153-8902, Japan
Received January 21, 2014; Accepted March 17, 2014; Published May 9, 2014

Magnetic and other unconventional electronic orders are discussed for heavy electrons. In addition to the ordinary Kondo lattice, we consider non-Kramers systems taking the two-channel Kondo lattice, and another lattice that consists of a singlet–triplet f2 configuration. The latter gives a scalar order with staggered sublattices of crystalline-electric-field (CEF) and Kondo singlets, which accounts for the observed order in PrFe4P12. In the two-channel Kondo lattice, an odd-frequency pairing is realized that becomes degenerate at half-filling with a diagonal composite order involving both localized and conduction electrons. The degeneracy is interpreted in terms of a hidden SO(5) symmetry. For the ordinary Kondo lattice with exchange interaction J, we take insulating ground states as reference. The metallic states are approached by infinitesimal doping of carriers either from the Kondo insulator or from the antiferromagnetic insulator. By adding intersite exchange we find that location of the band extremum of the heavy band depends on the value of J. The change of J gives topological change of the Fermi surface, which corresponds to a generalized version of the Lifshitz transition, and occurs separately from the quantum critical point of the antiferromagnetic order.

©2014 The Author(s)
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https://doi.org/10.7566/JPSJ.83.061007

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