Abstract
Critical exponents of metal-insulator transitions are studied for an extended Hubbard model within the Hartree-Fock approximation. At zero temperature, we find that the first-order transition line between a symmetry broken (antiferromagnetic or charge-ordered) metal and an insulator terminates at the "marginally quantum critical point", where an unconventional universality class emerges. This universality is in agreement with the scaling theory and explains the exponents obtained by recent experiments on (V, Cr)2 O3 and κ-(ET)2 Cu (Cn)2 Cl in a unified way as a crossover from the marginally quantum universality and the Ising universality.
Original language | English |
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Pages (from-to) | 925-927 |
Number of pages | 3 |
Journal | Journal of Magnetism and Magnetic Materials |
Volume | 310 |
Issue number | 2 SUPPL. PART 1 |
DOIs | |
Publication status | Published - 2007 Mar 1 |
Externally published | Yes |
Keywords
- Metal-insulator transitions
- Mott transition
- Quantum critical phenomena
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics