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Metamagnetism and crystal-field splitting in pseudohexagonal CeRh3Si2

Andrea Amorese, Dmitry Khalyavin, Kurt Kummer, Nicholas B. Brookes, Clemens Ritter, Oksana Zaharko, Camilla Buhl Larsen, Orest Pavlosiuk, Adam P. Pikul, Dariusz Kaczorowski, Matthias Gutmann, Andrew T. Boothroyd, Andrea Severing, and Devashibhai T. Adroja
Phys. Rev. B 105, 125119 – Published 15 March 2022
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Abstract

CeRh3Si2 has been reported to exhibit metamagnetic transitions below 5 K, a giant crystal field splitting, and anisotropic magnetic properties from single crystal magnetization and heat capacity measurements. Here we report results of neutron and x-ray scattering studies of the magnetic structure and crystal-field excitations to further understand the magnetism of this compound. Inelastic neutron scattering and resonant inelastic x-ray scattering reveal a Jz=1/2 ground state for Ce when considering the crystallographic a direction as quantization axis, thus explaining the anisotropy of the static susceptibility. Furthermore, we find a total splitting of 78 meV for the J=5/2 multiplet. The neutron diffraction study in zero field reveals that, on cooling from the paramagnetic state, the system first orders at TN1=4.7K in a longitudinal spin density wave with ordered Ce moments along the b axis (i.e., the [0 1 0] crystal direction) and an incommensurate propagation vector k=(0,0.43,0). Below the lower-temperature transition TN2=4.48K, the propagation vector locks to the commensurate value k=(0,0.5,0), with a so-called lock-in transition. Our neutron diffraction study in applied magnetic field Hb axis shows a change in the commensurate propagation vector and development of a ferromagnetic component at H=3kOe, followed by a series of transitions before the fully field-induced ferromagnetic phase is reached at H=7kOe. This explains the nature of the steps previously reported in field-dependent magnetization measurements. A very similar behavior is also observed for the H [0 1 1] crystal direction.

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  • Received 23 August 2021
  • Revised 25 January 2022
  • Accepted 23 February 2022

DOI:https://doi.org/10.1103/PhysRevB.105.125119

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

Andrea Amorese1,*, Dmitry Khalyavin2, Kurt Kummer3, Nicholas B. Brookes3, Clemens Ritter4, Oksana Zaharko5, Camilla Buhl Larsen5, Orest Pavlosiuk6, Adam P. Pikul6, Dariusz Kaczorowski6, Matthias Gutmann2, Andrew T. Boothroyd7, Andrea Severing8, and Devashibhai T. Adroja2,9,†

  • 1Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187 Dresden, Germany
  • 2ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot Oxon OX11 0QX, United Kingdom
  • 3European Synchrotron Radiation Facility, 71 Avenue des Martyrs, CS40220, F-38043 Grenoble Cedex 9, France
  • 4Institut Laue-Langevin, 71 avenue des Martyrs, F-38042 Grenoble Cedex 9, France
  • 5Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
  • 6Institute of Low Temperature and Structure Research, Polish Academy of Sciences, ul. Okólna 2, 50-422 Wrocław, Poland
  • 7Department of Physics, Clarendon Laboratory, Oxford University, Oxford OX1 3PU, United Kingdom
  • 8Institute of Physics II, University of Cologne, Zülpicher Str. 77, D-50937 Cologne, Germany
  • 9Highly Correlated Matter Research Group, Physics Department, University of Johannesburg, PO Box 524, Auckland Park 2006, South Africa

  • *and.amorese@gmail.com
  • devashibhai.adroja@stfc.ac.uk

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Vol. 105, Iss. 12 — 15 March 2022

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