Spin correlations and exchange in square-lattice frustrated ferromagnets

M. Skoulatos; J. P. Goff; C. Geibel; E. E. Kaul; R. Nath; N. Shannon; B. Schmidt; A. P. Murani; P. P. Deen; M. Enderle; A. R. Wildes

doi:10.1209/0295-5075/88/57005

All issues

Volume 88 / No 5 (December 2009)

EPL, 88 5 (2009) 57005

Abstract

Issue		EPL Volume 88, Number 5, December 2009


Article Number		57005
Number of page(s)		5
Section		Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI		https://doi.org/10.1209/0295-5075/88/57005
Published online		11 December 2009

EPL, 88 (2009) 57005

Spin correlations and exchange in square-lattice frustrated ferromagnets

M. Skoulatos¹, J. P. Goff², C. Geibel³, E. E. Kaul³, R. Nath³, N. Shannon⁴, B. Schmidt³, A. P. Murani⁵, P. P. Deen⁵, M. Enderle⁵ and A. R. Wildes⁵

¹ Helmholtz Centre Berlin for Materials and Energy - Hahn-Meitner-Platz 1, 14109 Berlin, Germany, EU
² Department of Physics, Royal Holloway, University of London - Egham, Surrey TW20 0EX, UK, EU
³ Max-Planck Institute for Chemical Physics of Solids - Nöthnitzer Str. 40, Dresden 01187, Germany, EU
⁴ H.H. Wills Physics Laboratory, University of Bristol - Bristol BS8 1TL, UK, EU
⁵ Institut Laue-Langevin - BP 156X, 38042 Grenoble Cedex, France, EU

Corresponding author: markos.skoulatos@helmholtz-berlin.de

Received: 14 October 2009
Accepted: 12 November 2009

Abstract

The J₁-J₂ model on a square lattice exhibits a rich variety of different forms of magnetic order that depend sensitively on the ratio of exchange constants $J_{2}/J_{1}$ . We use bulk magnetometry and polarized neutron scattering to determine J₁ and J₂ unambiguously for two materials in a new family of vanadium phosphates, Pb₂VO(PO₄)₂ and SrZnVO(PO₄)₂, and we find that they have ferromagnetic J₁. The ordered moment in the collinear antiferromagnetic ground state is reduced, and the diffuse magnetic scattering is enhanced, as the predicted bond-nematic region of the phase diagram is approached.

PACS: 75.30.Et – Exchange and superexchange interactions / 75.40.Cx – Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.) / 75.40.Gb – Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.)

© EPLA, 2009

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