Quantum-critical superconductivity in underdoped cuprates

Details Quantum-critical superconductivity in underdoped cuprates Quantum-critical superconductivity in underdoped cuprates

2000-05-09

arxiv.org/abs/cond-mat/0005163v3

EUROPHYS. LETT., v55, p369 (2001)

Physics

Condensed Matter

Superconductivity

5 pages, 3 figures

Scientific paper

10.1209/epl/i2001-00425-9

We argue that the pseudogap phase may be an attribute of the non-BCS pairing of quantum-critical, diffusive fermions near the antiferromagnetic quantum critical point. We derive and solve a set of three coupled Eliashberg-type equations for spin-mediated pairing and show that in some $T$ range below the pairing instability, there is no feedback from superconductivity on fermionic excitations, and fermions remain diffusive despite of the pairing. We conject that in this regime, fluctuations of the pairing gap destroy the superconducting condensate but preserve the leading edge gap in the fermionic spectral function.

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