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Phys. Rev. B 55, R11941 - R11944 (1997)

Spin dynamics of the spin-Peierls compound CuGeO3 under a magnetic field

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D. Poilblanc
Laboratoire de Physique Quantique, and UnitéMixte de Recherche 5626, C.N.R.S., UniversitéPaul Sabatier, 31062 Toulouse, France

J. Riera
Instituto de Fisica Rosario, Universidad National de Rosario, Bv. 27 de Febrero 210 bis - 2000 Rosario, Argentina

C. A. Hayward
Laboratoire de Physique Quantique, UniversitéPaul Sabatier, 31062 Toulouse, France

C. Berthier
Grenoble High Magnetic Field Laboratory, Max-Planck-Institut für Festkörperforschung
and Laboratoire de Spectrométrie Physique, UnitéMixte de Recherche No. 5588 du Centre National de la Recherche Scientifique, UniversitéJoseph Fourier Grenoble I, BP 87, 38402 St.-Martin d'H`eres Cedex, France

M. Horvatic
Grenoble High Magnetic Field Laboratory, Max-Planck-Institut für Festkörperforschung

Rapid Communication Received 15 January 1997

The magnetic field driven transition in the spin-Peierls system CuGeO3 associated with the closing of the spin gap is investigated numerically. The field dependence of the spin dynamical structure factor (seen by inelastic neutron scattering) and of the momentum-dependent static susceptibility are calculated. In the dimerized phase (Hc), we suggest that the strong field dependence of the transverse susceptibility could be experimentally seen from the low-temperature spin-echo relaxation rate 1/T2G or the second moment of the nuclear magnetic resonance spectrum. Above Hc low-energy-spin excitations appear at incommensurate wave vectors where the longitudinal susceptibility χzz(q) peaks.


©1997 The American Physical Society

URL: http://link.aps.org/abstract/PRB/v55/pR11941
DOI: 10.1103/PhysRevB.55.R11941
PACS: 75.10.Hk, 74.72.-h, 71.27.+a, 71.55.-i

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