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

被引：82

作者：

Ain, M

Lorenzo, JE

Regnault, LP

Dhalenne, G

Revcolevschi, A

Hennion, B

Jolicoeur, T

机构：

[1] EUROPEAN SYNCHROTRON RADIAT FACIL, F-38043 GRENOBLE, FRANCE

[2] CENG, LAB MAGNETISME & DIFFRACT NEUTRON, F-38054 GRENOBLE 9, FRANCE

[3] UNIV PARIS 11, UA CNRS 466, LAB CHIM SOLIDES, F-91405 ORSAY, FRANCE

[4] CENS, SERV PHYS THEOR, F-91191 GIF SUR YVETTE, FRANCE

来源：

PHYSICAL REVIEW LETTERS | 1997年 / 78卷 / 08期

关键词：

D O I：

10.1103/PhysRevLett.78.1560

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have studied magnetic excitations in the spin-Peierls phase of CuGeO3 by inelastic neutron scattering. There is a dispersive mode which is gapped throughout the Brillouin zone. This mode is separated by an unexpected second gap of approximate to 2 meV, from a continuum of magnetic excitations. The first gap (or ''triplet gap'') and its associated dispersive mode are 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.

引用

页码：1560 / 1563

页数：4

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