Central mode and spin confinement near the boundary of the superconducting phase in Y Ba2 Cu3 O6.353 (Tc =18 K)

C. Stock, W. J L Buyers, Z. Yamani, C. L. Broholm, Jaiho Chung, Z. Tun, R. Liang, D. Bonn, W. N. Hardy, R. J. Birgeneau

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Abstract

We have mapped the neutron scattering spin spectrum at low energies in Y Ba2 Cu3 O6.353 (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 Å in-plane and 8±2 Å 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.

Original languageEnglish
Article number100504
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume73
Issue number10
DOIs
Publication statusPublished - 2006 Mar 29
Externally publishedYes

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Doping (additives)
Antiferromagnetism
Spin fluctuations
Neutron scattering
Superconductivity
antiferromagnetism
neutron scattering
superconductivity
mirrors
energy
Direction compound

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Central mode and spin confinement near the boundary of the superconducting phase in Y Ba2 Cu3 O6.353 (Tc =18 K). / Stock, C.; Buyers, W. J L; Yamani, Z.; Broholm, C. L.; Chung, Jaiho; Tun, Z.; Liang, R.; Bonn, D.; Hardy, W. N.; Birgeneau, R. J.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 73, No. 10, 100504, 29.03.2006.

Research output: Contribution to journalArticle

Stock, C. ; Buyers, W. J L ; Yamani, Z. ; Broholm, C. L. ; Chung, Jaiho ; Tun, Z. ; Liang, R. ; Bonn, D. ; Hardy, W. N. ; Birgeneau, R. J. / Central mode and spin confinement near the boundary of the superconducting phase in Y Ba2 Cu3 O6.353 (Tc =18 K). In: Physical Review B - Condensed Matter and Materials Physics. 2006 ; Vol. 73, No. 10.
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AU - Yamani, Z.

AU - Broholm, C. L.

AU - Chung, Jaiho

AU - Tun, Z.

AU - Liang, R.

AU - Bonn, D.

AU - Hardy, W. N.

AU - Birgeneau, R. J.

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