Anisotropy of the spin interactions in the spin-Peierls compound : A new magnetic excitation branch

J. E. Lorenzo; L. P. Regnault; J. P. Boucher; B. Hennion; G. Dhalenne; A. Revcolevschi

doi:10.1209/epl/i1999-00212-8

All issues

Volume 45 / No 5 (March I 1999)

Europhys. Lett., 45 5 (1999) 619-625

Abstract

Issue		Europhys. Lett. Volume 45, Number 5, March I 1999


Page(s)		619 - 625
Section		Condensed matter: electronic structure, electrical, magnetic and optical properties
DOI		https://doi.org/10.1209/epl/i1999-00212-8
Published online		01 September 2002

Europhys. Lett., 45 (5), pp. 619-625 (1999)

Anisotropy of the spin interactions in the spin-Peierls compound $\rm CuGeO_3$ : A new magnetic excitation branch

J. E. Lorenzo¹, L. P. Regnault², J. P. Boucher³, B. Hennion⁴, G. Dhalenne⁵ and A. Revcolevschi⁵

¹ Laboratoire de Cristallographie du CNRS - BP. 166, 38042 Grenoble, France
² CEA/Département de Recherche Fondamentale sur la Matière Condensée, Service de Physique Statistique, Magnétisme et Supraconductivité, Laboratoire de Magnétisme et Diffraction Neutronique, Centre d'Etudes Nucléaires - 38054 Grenoble Cedex 9, France
³ Laboratoire de Spectrométrie Physique, Université Joseph Fourier Grenoble I - BP 87, 38042 Saint Martin d'Hères Cedex, France
⁴ Laboratoire Leon Brillouin CEA-CNRS, CEA-Saclay 91191 Gif sur Yvette, cedex, France
⁵ Laboratoire de Chimie des Solides, CNRS URA 446, Université Paris Sud, Bât. 414 91405 Orsay, France

Received: 14 September 1998
Accepted: 22 December 1998

Abstract

We present new inelastic neutron scattering data which show that a second magnetic branch (optic branch) exists in $\rm CuGeO_3$ and gives a non-negligible spectral weight to the scattering. From the dependencies on the scattering vector and the magnetic field of the inelastic neutron intensity at scattering vectors (0, Q_k, $Q_l+\frac12$ ), we are led to the conclusion that both this new branch and the previously reported have anomalous structure factors and polarisations.

PACS: 75.10.Jm – Quantized spin models / 75.40.Gb – Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.) / 75.30.Gw – Magnetic anisotropy

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