Competing exchange interactions in

M. Boehm; S. Coad; B. Roessli; A. Zheludev; M. Zolliker; P. Böni; H. Eisaki; N. Motoyama; S. Uchida

doi:10.1209/epl/i1998-00322-3

All issues

Volume 43 / No 1 (July I 1998)

Europhys. Lett., 43 1 (1998) 77-82

Abstract

Issue		Europhys. Lett. Volume 43, Number 1, July I 1998


Page(s)		77 - 82
Section		Condensed matter: electronic structure, electrical, magnetic and optical properties
DOI		https://doi.org/10.1209/epl/i1998-00322-3
Published online		01 September 2002

Europhys. Lett., 43 (1), pp. 77-82 (1998)

Competing exchange interactions in $\rm Li_2CuO_2$

M. Boehm¹, S. Coad²^,3, B. Roessli¹, A. Zheludev⁴, M. Zolliker¹^,3, P. Böni¹, D. McK. Paul², H. Eisaki⁵, N. Motoyama⁵ and S. Uchida⁵

¹ Laboratorium für Neutronenstreuung, Eidgenössische Technische Hochschule Zürich Paul Scherrer Institut - CH-5232 Villigen PSI, Switzerland
² Department of Physics, University of Warwick - Coventry, UK
³ Institut Laue-Langevin, Av. des Martyrs - B.P. 156, F-36000 Grenoble, France
⁴ Brookhaven National Laboratory - Upton NY 11973, USA
⁵ Department of Superconductivity, University of Tokyo - Tokyo 113, Japan

Received: 5 March 1998
Accepted: 19 May 1998

Abstract

The dispersion of the spin-waves in single crystals of $\rm Li_2CuO_2$ has been investigated by means of inelastic neutron scattering. The results yield a single spin-wave branch characterized by a large gap $\Delta =1.4\;{\rm meV}$ at the zone centre due to easy-axis uniaxial anisotropy. Linear spin-wave theory is used to obtain the exchange integrals in this material. It turns out that the nearest-neighbor exchange interactions in the basal plane are antiferromagnetic leading to frustration between the magnetic moments. Our results show that $\rm Li_2CuO_2$ is an S=1/2 antiferromagnetic insulator with competing interactions.

PACS: 75.25.+z – Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source X-ray scattering, etc.) / 75.30.Ds – Spin waves / 75.40.Cx – Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.)

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