Fluctuation-induced non-Fermi-liquid behavior near a quantum phase transition in itinerant electron systems

摘要: The signature for a non-Fermi-liquid behavior near quantum phase transition has been observed in thermal and transport properties of many metallic systems at low temperatures. In the present work we consider specific examples an itinerant ferromagnet as well antiferromagnet limit vanishing temperature. temperature variation spin susceptibility, electrical resistivity, heat, NMR relaxation rates temperatures is calculated infinite exchange enhancement within framework self-consistent fluctuation theory. resulting due to presence low-lying critically damped fluctuations these systems. theory presented here gives leading low-temperature behavior, it turns out that correlation term always smaller than mean field three two space dimensions. A comparison with illustrative experimental results some typical done. Finally, make remarks on effect disorder