Journal
PHYSICAL REVIEW LETTERS
Volume 84, Issue 24, Pages 5608-5611Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.84.5608
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We consider spin and electronic properties of itinerant electron systems, described by the spin-fermion model, near the antiferromagnetic critical point. We expand in the inverse number of hot spots in the Brillouin zone, N, and present the results beyond the previously studied N = infinity limit. We found two new effects: (i) Fermi surface becomes nested at hot spots, and (ii) vertex corrections give rise to anomalous spin dynamics and change the dynamical critical exponent From z = 2 to z > 2. To first order in 1/N we found z = 2N/(N - 2) which for a physical N = 8 yields z approximate to 2.67.
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