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We have studied magnetic excitations in the dimerized spin-Peierls phase ofCuGeO3, by high resolution inelastic neutron scattering. We measured thewell-defined spin triplet dispersive mode which is gapped throughout the wholeBrillouin zone. We also observed that this mode is separated by an unexpectedsecond gap of order 2 meV from a continuum of magnetic excitations extending tohigher energy. The first gap (or 'triplet gap') and its associated dispersivemode is due to the breaking of a singlet dimer into a delocalized triplet. Wepropose that the second gap (or 'solitonic gap') and the continuum correspondto dissociation of that triplet into two unbound spin-1/2 solitons that areseparated by a dimerized region of arbitrary length.Comment: 7 pages, 3 Postscript figures, REVTeX 2.

physical review letters

Double Gap and Solitonic Excitations in the Spin-Peierls Chain<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>CuGeO</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Double Gap and Solitonic Excitations in the Spin-Peierls ChainCuGeO3