Double gap and solitonic excitations in the spin-Peierls chain CuGeO3

Details Double gap and solitonic excitations in the spin-Peierls chain CuGeO3 Double gap and solitonic excitations in the spin-Peierls chain CuGeO3

1998-02-09

arxiv.org/abs/cond-mat/9802088v1

Phys. Rev. Lett. 78, 1560 (1997)

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 3 Postscript figures, REVTeX 2.0

Scientific paper

10.1103/PhysRevLett.78.1560

We have studied magnetic excitations in the dimerized spin-Peierls phase of CuGeO3, by high resolution inelastic neutron scattering. We measured the well-defined spin triplet dispersive mode which is gapped throughout the whole Brillouin zone. We also observed that this mode is separated by an unexpected second gap of order 2 meV from a continuum of magnetic excitations extending to higher energy. The first gap (or 'triplet gap') and its associated dispersive mode is due to the breaking of a singlet dimer into a delocalized triplet. We propose that the second gap (or 'solitonic gap') and the continuum correspond to dissociation of that triplet into two unbound spin-1/2 solitons that are separated by a dimerized region of arbitrary length.

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