Magnetic order and exchange coupling in the frustrated diamond-lattice antiferromagnet MnSc2Se4

K. Guratinder, V. Tsurkan, L. Prodan, L. Keller, J. P. Embs, F. Juranyi, M. Medarde, Ch. Rüegg, and O. Zaharko
Phys. Rev. B 105, 174423 – Published 19 May 2022

Abstract

We report the magnetic properties of the A-site spinel compound MnSc2Se4. The macroscopic magnetic measurements uncover successive magnetic transitions at TN1=2.04 K, followed by two further transitions at TN2=1.8 K and TN3=1.6 K. Neutron powder diffraction reveals that both TN2<T<TN1 and T<TN3 orders are associated with the propagation vector k=(3/4,3/4,0), while the magnetic structures are collinear amplitude modulated and helical, respectively. Using neutron powder spectroscopy we demonstrated the effect of substitution of S by Se on the magnetic exchange. The energy range of the spin-wave excitations is suppressed due to the chemical pressure of the X ion in MnSc2X4 (X=S, Se) spinels.

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  • Received 10 November 2021
  • Revised 23 March 2022
  • Accepted 25 March 2022

DOI:https://doi.org/10.1103/PhysRevB.105.174423

©2022 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

K. Guratinder*,†

  • Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute, CH-5232 Villigen, Switzerland and Department of Quantum Matter Physics, University of Geneva, CH-1211 Geneva, Switzerland

V. Tsurkan and L. Prodan

  • Experimental Physics V, University of Augsburg, D-86135 Augsburg, Germany and Institute of Applied Physics, str. Academiei 5, MD 2028, Chisinau, Republic of Moldova

L. Keller, J. P. Embs, and F. Juranyi

  • Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute, CH-5232 Villigen, Switzerland

M. Medarde

  • Laboratory for Multiscale Materials Experiments, Paul Scherrer Institute, CH-5232 Villigen, Switzerland

Ch. Rüegg

  • Neutrons and Muons Research Division, Paul Scherrer Institut, CH-5232 Villigen, Switzerland and Department of Quantum Matter Physics, University of Geneva, CH-1211 Geneva, Switzerland

O. Zaharko

  • Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute, CH-5232 Villigen, Switzerland

  • *Present address: Max Planck Institute for Solid State Research, 70569, Stuttgart, Germany.
  • Corresponding authors: g.kaur@fkf.mpg.de; oksana.zaharko@psi.ch

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Vol. 105, Iss. 17 — 1 May 2022

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