Magnetic field resonantly enhanced free spins in heavily underdoped YBa2 Cu3 O6+x

C. Stock, W. J L Buyers, K. C. Rule, Jaiho Chung, R. Liang, D. Bonn, W. N. Hardy

Research output: Contribution to journalArticle

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Abstract

Using neutron scattering, we investigate the effect of a magnetic field on the static and dynamic spin response in heavily underdoped superconducting YBa2 Cu3 O6+x (YBCO6+x) with x=0.33 (Tc =8K) and 0.35 (Tc =18K). In contrast to the heavily doped and superconducting monolayer cuprates, the elastic central peak characterizing static spin correlations does not respond observably to a magnetic field which suppresses superconductivity. Instead, we find a magnetic-field-induced resonant enhancement of the spin fluctuations. The energy scale of the enhanced fluctuations matches the Zeeman energy within both the normal and vortex phases, while the momentum dependence is the same as the zero-field bilayer response. The magnitude of the enhancement is very similar in both phases with a fractional intensity change of (I/ I0 -1) ∼0.1. We suggest that the enhancement is not directly correlated with superconductivity but is the result of almost free spins located near hole-rich regions.

Original languageEnglish
Article number184514
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume79
Issue number18
DOIs
Publication statusPublished - 2009 May 1

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Magnetic fields
Superconductivity
augmentation
superconductivity
magnetic fields
Spin dynamics
Spin fluctuations
spin dynamics
Neutron scattering
cuprates
Monolayers
Momentum
neutron scattering
Vortex flow
vortices
momentum
energy

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Magnetic field resonantly enhanced free spins in heavily underdoped YBa2 Cu3 O6+x. / Stock, C.; Buyers, W. J L; Rule, K. C.; Chung, Jaiho; Liang, R.; Bonn, D.; Hardy, W. N.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 79, No. 18, 184514, 01.05.2009.

Research output: Contribution to journalArticle

Stock, C. ; Buyers, W. J L ; Rule, K. C. ; Chung, Jaiho ; Liang, R. ; Bonn, D. ; Hardy, W. N. / Magnetic field resonantly enhanced free spins in heavily underdoped YBa2 Cu3 O6+x. In: Physical Review B - Condensed Matter and Materials Physics. 2009 ; Vol. 79, No. 18.
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