Central mode and spin confinement near the boundary of the superconducting phase in YBa[sub 2]Cu[sub 3]O[sub 6.353] (T[sub c] = 18 K)

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TypeArticle
Journal titlePhys. Rev. B
Physical Review B (Condensed Matter and Materials Physics)
Volume73
Issue10
Pages1005044; # of pages: 100501
Subjectbarium compounds; doping; high-temperature superconductors; neutron diffraction; soft modes; spin dynamics; spin fluctuations; yttrium compounds
AbstractWe 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 � in-plane and 8�2 � 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 N�el 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.
Publication date
Linkhttp://link.aps.org/abstract/PRB/v73/e100504
AffiliationNational Research Council Canada; NRC Canadian Neutron Beam Centre
Peer reviewedNo
NPARC number12339203
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Record identifier848e334f-a827-49ae-82a9-7fd42c9230dc
Record created2009-09-11
Record modified2016-05-09
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