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The Effect of velocity anisotropy on the antiferromagnetic instability of d wave superconductors

Jan, 2002
4 pages
Published in:
  • Phys.Rev.B 66 (2002) 094512
e-Print:
DOI:
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Abstract: (arXiv)
We consider the effective 2+1 dimensional electrodynamics (QED_3) of low-energy quasiparticles coupled to fluctuating vortex loops in the d-wave superconductor, with the velocity anisotropy: v_F not equal to v_Delta. This theory should be relevant to the quantum superconductor-insulator transition in underdoped cuprates. Working in the customary large-N approximation, we find that weak anisotropy is a marginally irrelevant perturbation to the Lorentz invariant QED_3, and that the critical number N_c of Dirac fields below which the theory suffers the antiferromagnetic (chiral) instability stays the same.
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