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Direct observation of field-induced incommensurate fluctuations in a one-dimensional S=1/2 antiferromagnet

Dender, DC; Hammar, PR; Reich, DH; Broholm, C; Aeppli, G; (1997) Direct observation of field-induced incommensurate fluctuations in a one-dimensional S=1/2 antiferromagnet. PHYS REV LETT , 79 (9) 1750 - 1753.

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Abstract

Neutron scattering from copper benzoate, Cu(C6D5COO)(2) . 3D(2)O, provides the first direct experimental evidence for field-dependent incommensurate low energy modes in a one-dimensional spin S = 1/2 antiferromagnet. Soft modes occur for wave vectors (q) over tilde = pi +/- delta (q) over tilde(H), where delta (q) over tilde(H) approximate to 2 pi M(H)/g mu(B) as predicted by Bethe ansatz and spinon descriptions of the S = 1/2 chain. Unexpected was a field-induced energy gap Delta(H) alpha H-alpha, where alpha = 0.65(3) as determined from specific heat measurements. At H = 7 T (g mu(B)H/J = 0.52), the magnitude of the gap varies from 0.06J to 0.3J depending on the orientation of the applied field.

Type: Article
Title: Direct observation of field-induced incommensurate fluctuations in a one-dimensional S=1/2 antiferromagnet
Keywords: MAGNETIC-FIELD, ANTI-FERROMAGNET, EXCITATIONS, SPECTRUM, NEUTRON, CHAINS
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/291992
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