We use the semi-classical Boltzmann equation to investigate transport properties such as electrical resistivity, thermal resistivity, thermopower, and the Peltier coefficient of disordered metals close to an antiferromagnetic quantum phase transition. In the quantum Griffiths phase, the electrons are scattered by spin-fluctuations in the rare regions. This leads to singular temperature dependencies not just at the quantum critical point, but in the entire Griffiths phase. We show that the resulting non-universal power-laws in transport properties are controlled by the same Griffiths exponent λ which governs the thermodynamics. λ takes the value zero at the quantum critical point and increases throughout the Griffiths phase. We also study some of the "universal" ratios commonly used to characterize Fermi-liquid behavior.
D. Nozadze and T. Vojta, "Non-Fermi Liquid Transport and "Universal" Ratios in Quantum Griffiths Phases," Journal of Physics: Conference Series, vol. 391, no. 1, Institute of Physics - IOP Publishing, Sep 2012.
The definitive version is available at https://doi.org/10.1088/1742-6596/391/1/012162
International Conference on Strongly Correlated Electron Systems (2011: Aug. 29-Sep. 3, Cambridge, United Kingdom)
Keywords and Phrases
Antiferromagnetics; Electrical resistivity; Fermi liquid behavior; Non-Fermi liquids; Peltier coefficients; Quantum critical points; Quantum phase transitions; Temperature dependencies; Boltzmann equation; Electric conductivity; Phase transitions; Quantum theory; Thermodynamics; Transport properties
International Standard Serial Number (ISSN)
Article - Conference proceedings
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01 Sep 2012