Non-fermi liquid behavior in itinerant antiferromagnets

Details Non-fermi liquid behavior in itinerant antiferromagnets Non-fermi liquid behavior in itinerant antiferromagnets

2004-01-21

arxiv.org/abs/cond-mat/0401375v1

Phys. Rev. Lett. v. 93, p. 016405 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

5p., 3figs

Scientific paper

10.1103/PhysRevLett.93.016405

We consider a two dimensional itinerant antiferromagnet near a quantum critical point. We show that, contrary to conventional wisdom, fermionic excitations in the ordered state are not the usual Fermi liquid quasiparticles. Instead, down to very low frequencies, the fermionic self energy varies as $\omega^{2/3}$. This non-Fermi liquid behavior originates in the coupling of fermions to the longitudinal spin susceptibility $\chi_{\parallel}(q, \Omega)$ in which the order-induced ``gap'' in the spectrum at $q=0$ dissolves into the Landau damping term at $v_F q >\Omega$. The transverse spin fluctuations obey $z=1$ scaling characteristic of spin waves, but remain overdamped in a finite range near the critical point.

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