Central mode and spin confinement near the boundary of the superconducting phase in YBa2Cu3O6.353 (Tc=18 K)
Research output: Contribution to journal › Research article › Contributed
Contributors
Abstract
We have mapped the neutron scattering spin spectrum at low-energies in YBa2Cu3O6.353 (Tc=18 K) 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 ~2 meV relaxation rate and the other a central mode with a relaxation rate that slows to less than 0.08 meV below Tc. The spectrum mirrors that of a soft mode driving a central mode. Extremely short correlation lengths, 42+-5 Angstrom in-plane and 8+-2 Angstrom 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 Neel 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.
Details
Original language | English |
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Article number | 100504 |
Journal | Physical Review B |
Volume | 73 |
Issue number | 10 |
Publication status | Published - 22 Mar 2006 |
Peer-reviewed | No |
Externally published | Yes |
External IDs
Scopus | 33645122976 |
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Keywords
Keywords
- cond-mat.supr-con, cond-mat.str-el