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Gradual pressure-induced enhancement of magnon excitations in CeCoSi

S. E. Nikitin, D. G. Franco, J. Kwon, R. Bewley, A. Podlesnyak, A. Hoser, M. M. Koza, C. Geibel, and O. Stockert
Phys. Rev. B 101, 214426 – Published 17 June 2020

Abstract

CeCoSi is an intermetallic antiferromagnet with a very unusual temperature-pressure phase diagram: at ambient pressure it orders below TN=8.8K, while application of hydrostatic pressure induces a new magnetically ordered phase with exceptionally high transition temperature of 40K at 1.5 GPa. We studied the magnetic properties and the pressure-induced magnetic phase of CeCoSi by means of elastic and inelastic neutron scattering (INS) and heat capacity measurements. At ambient pressure CeCoSi orders into a simple commensurate AFM structure with a reduced ordered moment of only mCe=0.37(6)μB. Specific heat and low-energy INS indicate a significant gap in the low-energy magnon excitation spectrum in the antiferromagnetic phase, with the CEF excitations located above 10 meV. Hydrostatic pressure gradually shifts the energy of the magnon band towards higher energies and the temperature dependence of the magnons measured at 1.5 GPa is consistent with the phase diagram. Moreover, the CEF excitations are also drastically modified under pressure.

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  • Received 1 April 2020
  • Revised 6 May 2020
  • Accepted 19 May 2020

DOI:https://doi.org/10.1103/PhysRevB.101.214426

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Open access publication funded by the Max Planck Society.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

S. E. Nikitin1,2,*, D. G. Franco1,3, J. Kwon1, R. Bewley4, A. Podlesnyak5, A. Hoser6, M. M. Koza7, C. Geibel1, and O. Stockert1

  • 1Max Planck Institute for Chemical Physics of Solids, D-01187 Dresden, Germany
  • 2Institut für Festkörper- und Materialphysik, Technische Universität Dresden, D-01069 Dresden, Germany
  • 3Centro Atómico Bariloche and Instituto Balseiro, Comisión Nacional de Energía Atómica (CNEA), Universidad Nacional de Cuyo, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Av. E. Bustillo 9500, R8402AGP San Carlos de Bariloche, Río Negro, Argentina
  • 4ISIS Facility, STFC Rutherford Appleton Laboratory, Harwell Campus, Didcot OX11 0QX, United Kingdom
  • 5Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  • 6Helmholtz-Zentrum Berlin für Materialien und Energie, D-14109 Berlin, Germany
  • 7Institut Laue-Langevin, F-38042 Grenoble Cedex 9, France

  • *nikitin@cpfs.mpg.de

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Vol. 101, Iss. 21 — 1 June 2020

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