Volume 124, Number 5, December 2018
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||27 December 2018|
Spin-freezing and the Sachdev-Ye model
1 Department of Physics, University of Fribourg - 1700 Fribourg, Switzerland
2 Department of Physics, King's College London - Strand, London WC2R 2LS, UK
3 Department of Physics, Saitama University - Saitama 338-8570, Japan
Received: 13 June 2018
Accepted: 21 November 2018
Spin-freezing is the origin of bad-metal physics and non-Fermi liquid (non-FL) properties in a broad range of correlated compounds. In a multi-orbital lattice system with Hund coupling, doping of the half-filled Mott insulator results in a highly incoherent metal with frozen magnetic moments. These moments fluctuate and collapse in a crossover region that is characterized by unusual non-Fermi liquid properties such as a self-energy whose imaginary part varies over a significant energy range. At low enough temperature, the local moment fluctuations induce electron pairing, which may be a generic mechanism for unconventional superconductivity. While this physics has been discovered in numerical studies of multi-orbital Hubbard systems, it exhibits a striking similarity to the analytically solvable Sachdev-Ye (SY) model, and its recent fermionic extensions. Here, we explore the relation between spin-freezing and SY physics, and thus shed light on fundamental properties of Hund metals.
PACS: 71.10.Fd – Lattice fermion models (Hubbard model, etc.)
© EPLA, 2018
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