TY - JOUR
T1 - Non-Fermi-liquid behavior from two-dimensional antiferromagnetic fluctuations
T2 - A renormalization-group and large-N analysis
AU - Pankov, Sergey
AU - Florens, Serge
AU - Georges, Antoine
AU - Kotliar, Gabriel
AU - Sachdev, Subir
PY - 2004/2/27
Y1 - 2004/2/27
N2 - We analyze the Hertz-Moriya-Millis theory of an antiferromagnetic quantum critical point, in the marginal case of two dimensions (d = 2, z = 2). Up to next-to-leading order in the number of components (N) of the field, we find that logarithmic corrections do not lead to an enhancement of the Landau damping. This is in agreement with a renormalization-group analysis, for arbitrary N. Hence, the logarithmic effects are unable to account for the behavior reportedly observed in inelastic neutron scattering experiments on CeCu6-xAux. We also examine the extended dynamical mean-field treatment (local approximation) of this theory, and find that only subdominant corrections to the Landau damping are obtained within this approximation, in contrast to recent claims.
AB - We analyze the Hertz-Moriya-Millis theory of an antiferromagnetic quantum critical point, in the marginal case of two dimensions (d = 2, z = 2). Up to next-to-leading order in the number of components (N) of the field, we find that logarithmic corrections do not lead to an enhancement of the Landau damping. This is in agreement with a renormalization-group analysis, for arbitrary N. Hence, the logarithmic effects are unable to account for the behavior reportedly observed in inelastic neutron scattering experiments on CeCu6-xAux. We also examine the extended dynamical mean-field treatment (local approximation) of this theory, and find that only subdominant corrections to the Landau damping are obtained within this approximation, in contrast to recent claims.
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U2 - 10.1103/PhysRevB.69.054426
DO - 10.1103/PhysRevB.69.054426
M3 - Article
AN - SCOPUS:1642387102
SN - 1098-0121
VL - 69
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 5
ER -