Central mode and spin confinement near the boundary of the superconducting phase in YBa2Cu3O6.353 (Tc=18K)
C. Stock, W. J. L. Buyers, Z. Yamani, C. L. Broholm, J.-H. Chung, Z. Tun, R. Liang, D. Bonn, W. N. Hardy, R. J. Birgeneau
DOI 10.1103/PhysRevB.73.100504 · Physical Review B
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Abstract
We have mapped the neutron scattering spin spectrum at low energies in YBa2Cu3O6.353 (Tc=18K), where the doping ∼0.06 is near the critical value (pc=0.055) for superconductivity. No coexistence with long-range-ordered antiferromagnetism is found. The spins fluctuate on two energy scales: one a damped spin response with a ≃2meV relaxation rate and the other a central mode with a relaxation rate that slows to less than 0.08meV below Tc. The spectrum mirrors that of a soft mode driving a central mode. Extremely short correlation lengths, 42±5Å in-plane and 8±2Å along the c direction, and isotropic spin orientations for the central mode indicate that the correlations are subcritical with respect to any second-order transition to Néel order. The dynamics follows a model where damped spin fluctuations are coupled to the slow fluctuations of regions with correlations shortened by the hole doping.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O6.353 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 18 | Pressure not reported | onset |
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