Magnetic-field dependence of the magnetic excitations in ordered

N. Cavadini; M. Schneider; P. Allenspach; P. C. Canfield; Ph. Bourges

doi:10.1209/epl/i2003-00568-7

All issues

Volume 63 / No 4 (August 2003)

Europhys. Lett., 63 4 (2003) 597-602

Abstract

Issue		Europhys. Lett. Volume 63, Number 4, August 2003


Page(s)		597 - 602
Section		Condensed matter: electronic structure, electrical, magnetic, and optical properties
DOI		https://doi.org/10.1209/epl/i2003-00568-7
Published online		01 November 2003

Europhys. Lett., 63 (4), pp. 597-602 (2003)

Magnetic-field dependence of the magnetic excitations in ordered $\chem{HoNi_{2}B_{2}C}$

N. Cavadini¹, M. Schneider¹, P. Allenspach¹, P. C. Canfield² and Ph. Bourges³

¹ Laboratory for Neutron Scattering, ETH Zürich & Paul Scherrer Institut 5232 Villigen PSI, Switzerland
² Ames Laboratory, Department of Physics and Astronomy, Iowa State University Ames, IA 50011, USA
³ Laboratoire Léon Brillouin, CEA/CNRS-Saclay 91191 Gif-sur-Yvette, France

Received: 10 December 2002
Accepted: 16 June 2003

Abstract

The effect of an external magnetic field H on the magnetic excitations in ordered $\chem{HoNi_{2}B_{2}C}$ is investigated by inelastic neutron scattering on single crystals for the first time. A Zeeman-like renormalization of the magnetic excitations is observed at fixed $T=2$ $\un{K}$ and $H\parallel[1,1,0]$ up to $H=5$ $\un{T}$ . Above $H\sim 1.1$ $\un{T}$ the renormalization occurs linearly, following the expectation for the $\chem{Ho^{3+}}$ crystal electric-field levels at finite fields. However, in the range $0<H<1.1$ $\un{T}$ clear discontinuities mark the successive metamagnetic transitions reported for the ground state of the title compound. The comparison of the magnetic excitations between the antiferromagnetic ( $H<0.4$ $\un{T}$ ), helicoidal ( $0.4\le H<1.1$ $\un{T}$ ) and ferromagnetic ( $H \ge 1.1$ $\un{T}$ ) ground state allows, by first principles, the determination of the leading exchange interactions between the rare-earth ions. The quantitative results are put into the context of recent theoretical models.

PACS: 75.10.Dg – Crystal-field theory and spin Hamiltonians / 75.30.Et – Exchange and superexchange interactions / 78.70.Nx – Neutron inelastic scattering

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