| Issue |
Europhys. Lett.
Volume 54, Number 4, May 2001
|
|
|---|---|---|
| Page(s) | 488 - 494 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2001-00266-0 | |
| Published online | 01 December 2003 | |
Coherent 
incoherent pairing in
2D systems near magnetic instability
1
Department of Physics, University of Wisconsin - Madison, WI 53706, USA
2
Department of Codensed Matter Physics, Weizmann Institute of Science - Israel
Received:
21
December
2000
Accepted:
28
February
2001
We study the superconductivity in 2D fermionic systems near
antiferromagnetic instability, assuming that the pairing is mediated
by spin fluctuations. This pairing involves fully incoherent fermions
and diffusive spin excitations. We show that the competition between
fermionic incoherence and strong pairing interaction yields the
pairing instability temperature Tins which increases and
saturates as the magnetic correlation length 
.
We argue that in this quantum-critical regime the pairing problem is
qualitatively different from the BCS one.
PACS: 71.10.Hf – Non-Fermi-liquid ground states, electron phase diagrams and phase transitions in model systems / 71.10.Li – Excited states and pairing interactions in model systems / 74.20.Mn – Nonconventional mechanisms (spin fluctuations, polarons and bipolarons, resonating valence bond model, anyon mechanism, marginal Fermi liquid, Luttinger liquid, etc.)
© EDP Sciences, 2001
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