Magnetic structure and spin waves in the frustrated ferro-antiferromagnet Pb 2 VO(PO 4 ) 2 .

Autor: Bettler S; Laboratory for Solid State Physics, ETH Zürich, 8093 Zürich, Switzerland., Landolt F; Laboratory for Solid State Physics, ETH Zürich, 8093 Zürich, Switzerland., Aksoy ÖM; Laboratory for Solid State Physics, ETH Zürich, 8093 Zürich, Switzerland., Yan Z; Laboratory for Solid State Physics, ETH Zürich, 8093 Zürich, Switzerland., Gvasaliya S; Laboratory for Solid State Physics, ETH Zürich, 8093 Zürich, Switzerland., Qiu Y; NIST Centre for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20878, USA., Ressouche E; Univ. Grenoble Alpes, CEA, INAC-MEM, 38000 Grenoble, France., Beauvois K; Univ. Grenoble Alpes, CEA, INAC-MEM, 38000 Grenoble, France., Raymond S; Univ. Grenoble Alpes, CEA, INAC-MEM, 38000 Grenoble, France., Ponomaryov AN; Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany., Zvyagin SA; Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany., Zheludev A; Laboratory for Solid State Physics, ETH Zürich, 8093 Zürich, Switzerland.
Jazyk: angličtina
Zdroj: Physical review. B [Phys Rev B] 2019; Vol. 99 (18).
DOI: 10.1103/physrevb.99.184437
Abstrakt: Single crystal neutron diffraction, inelastic neutron scattering, and electron spin resonance experiments are used to study the magnetic structure and spin waves in Pb 2 VO(PO 4 ) 2 , a prototypical layered S = 1 / 2 ferromagnet with frustrating next-nearest neighbor antiferromagnetic interactions. The observed excitation spectrum is found to be inconsistent with a simple square lattice model previously proposed for this material. At least four distinct exchange coupling constants are required to reproduce the measured spin wave dispersion. The degree of magnetic frustration is correspondingly revised and found to be substantially smaller than in all previous estimates.
Databáze: MEDLINE
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