Time-Resolved Quasiparticle Dynamics in the Spin-Density-Wave State

Details Time-Resolved Quasiparticle Dynamics in the Spin-Density-Wave State Time-Resolved Quasiparticle Dynamics in the Spin-Density-Wave State

2006-10-12

arxiv.org/abs/cond-mat/0610353v1

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figures

Scientific paper

Time-resolved photoinduced reflectivity is measured in the spin-density-wave (SDW) phase using itinerant antiferromagnets UMGa$_{5}$ (M=Ni, Pt). For UNiGa$_{5}$ [$T_{N}$=85 K, $Q$=($\pi$,$\pi$,$\pi$)], the relaxation time $\tau$ shows a sharp increase at $T_{N}$ consistent with the opening of a SDW gap. For UPtGa$_{5}$ [$T_{N}$=26 K, $Q$=(0,0,$\pi$)], no change in $\tau$ is observed at $T_{N}$ or at the lowest temperatures. We attribute this to the absence of the SDW gap at the Fermi level, due to a different modulation vector $Q$, which leads to a gapless quasiparticle spectrum. Our results challenge the conventional wisdom that a SDW phase necessarily implies a SDW gap at the Fermi level.

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