Spin gaps and magnetic structure of NaxCoO2

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dc.creatorHelme, L. M.
dc.creatorBoothroyd, A. T.
dc.creatorColdea, R.
dc.creatorPrabhakaran, D.
dc.creatorStunault, A.
dc.creatorMcIntyre, G. J.
dc.creatorKernavanois, N.
dc.date2005-10-13
dc.date.accessioned2026-07-07T06:44:22Z
dc.date.available2026-07-07T06:44:22Z
dc.descriptionWe present two experiments that provide information on spin anisotropy and the magnetic structure of NaxCoO2. First, we report low-energy neutron inelastic scattering measurements of the zone-center magnetic excitations in the magnetically ordered phase of Na0.75CoO2. The energy spectra suggest the existence of two gaps, and are very well fitted by a spin-wave model with both in-plane and out-of-plane anisotropy terms. The gap energies decrease with increasing temperature and both gaps are found to have closed when the temperature exceeds the magnetic ordering temperature T_m~22 K. Secondly, we present neutron diffraction studies of Na0.85CoO2 with a magnetic field applied approximately parallel to the c axis. For fields in excess of ~8T a magnetic Bragg peak was observed at the (0,0,3) position in reciprocal space. We interpret this as a spin-flop transition of the A-type antiferromagnetic structure, and we show that the spin-flop field is consistent with the size of the anisotropy gap.
dc.description9 pages, 7 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0510360
dc.identifierhttp://arxiv.org/abs/cond-mat/0510360
dc.identifierPhys. Rev. B. 73, 054405 (2006)
dc.identifierdoi:10.1103/PhysRevB.73.054405
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/102756
dc.subjectStrongly Correlated Electrons
dc.subjectSuperconductivity
dc.titleSpin gaps and magnetic structure of NaxCoO2
dc.typetext

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