| Issue |
Europhys. Lett.
Volume 49, Number 4, February II 2000
|
|
|---|---|---|
| Page(s) | 487 - 493 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2000-00175-8 | |
| Published online | 01 September 2002 | |
Impurity effects on the flux phase quantum-critical-point scenario
Max-Planck-Institut für Festkörperforschung
Heisenbergstr. 1, 70569 Stuttgart, Germany
Received:
28
June
1999
Accepted:
7
December
1999
Impurity substitution of Zn in La-214 and (Y, Ca)-123 high-
superconductors suppresses but does not affect appreciably
the onset of the pseudogap phase in the underdoped region nor
optimal doping or the position of the inferred quantum critical point.
Based on a 1/N expansion of the t-J model we explain these findings
as well as the similar dependence on a
magnetic field in terms of a quantum-critical-point scenario where a flux
phase causes the pseudogap.
PACS: 74.10.+v – Occurrence, potential candidates / 74.25.Dw – Superconductivity phase diagrams / 74.20.Mn – Nonconventional mechanisms (spin fluctuations, polarons and bipolarons, resonating valence band model, anyon mechanism, marginal Fermi liquid, Luttinger liquid, etc.)
© EDP Sciences, 2000
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