Correlation length in cuprate superconductors deduced from impurity-induced magnetization
S. Ouazi, J. Bobroff, H. Alloul, W. A. MacFarlane
DOI 10.1103/PhysRevB.70.104515 · Physical Review B
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Abstract
We report a new multinuclei based nuclear magnetic resonance method which allows us to image the staggered polarization induced by nonmagnetic Li impurities in underdoped (O6.6) and slightly overdoped (O7) YBa2Cu3O6+y above TC. The spatial extension of the polarization ξimp approximately follows a Curie law, increasing up to six lattice constants at 80K at O6.6 in the pseudogap regime. Near optimal doping, the staggered magnetization has the same shape, with ξimp reduced by a factor 2. ξimp is argued to reveal the intrinsic magnetic correlation length of the pure system. It is found to display a smooth evolution through the pseudogap regime.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O6.6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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