Temperature dependence of the nodal Fermi velocity in layered cuprates

Details Temperature dependence of the nodal Fermi velocity in layered cuprates Temperature dependence of the nodal Fermi velocity in layered cuprates

2008-07-26

arxiv.org/abs/0807.4244v1

Phys. Rev. B 78, 060509(R) (2008)

Physics

Condensed Matter

Superconductivity

5 pages, 1 figure

Scientific paper

We explain recently observed linear temperature dependence of the nodal Fermi velocity $v_F (T)$ in near-optimally doped cuprates. We argue that it originates from electron-electron interaction, and is a fundamental property of an arbitrary 2D Fermi liquid. We consider a spin-fermion model with the same parameters as in earlier studies, and show that the T term is about 30% at 300K, in agreement with the data. We show that the sub-leading term in $v_F (T)$ is a regular (and small) $T^2$ correction. We also show that at a $2k_F$ quantum-critical point, temperature corrections to the dispersion are singular.

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