Investigation of the commensurate magnetic structure in the heavy-fermion compound CePt2In7 using magnetic resonant x-ray diffraction

Nicolas Gauthier, Didier Wermeille, Nicola Casati, Hironori Sakai, Ryan E. Baumbach, Eric D. Bauer, and Jonathan S. White
Phys. Rev. B 96, 064414 – Published 10 August 2017

Abstract

We investigated the magnetic structure of the heavy-fermion compound CePt2In7 below TN=5.34(2) K using magnetic resonant x-ray diffraction at ambient pressure. The magnetic order is characterized by a commensurate propagation vector k1/2=12,12,12 with spins lying in the basal plane. Our measurements did not reveal the presence of an incommensurate order propagating along the high-symmetry directions in reciprocal space but cannot exclude other incommensurate modulations or weak scattering intensities. The observed commensurate order can be described equivalently by either a single-k structure or by a multi-k structure. Furthermore we explain how a commensurate-only ordering may explain the broad distribution of internal fields observed in nuclear quadrupolar resonance experiments [Sakai et al., Phys. Rev. B 83, 140408 (2011)] that was previously attributed to an incommensurate order. We also report powder x-ray diffraction showing that the crystallographic structure of CePt2In7 changes monotonically with pressure up to P=7.3 GPa at room temperature. The determined bulk modulus B0=81.1(3) GPa is similar to those of the Ce-115 family. Broad diffraction peaks confirm the presence of pronounced strain in polycrystalline samples of CePt2In7. We discuss how strain effects can lead to different electronic and magnetic properties between polycrystalline and single crystal samples.

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  • Received 24 April 2017
  • Revised 19 July 2017

DOI:https://doi.org/10.1103/PhysRevB.96.064414

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Nicolas Gauthier1,*, Didier Wermeille2,3, Nicola Casati4, Hironori Sakai5, Ryan E. Baumbach6,†, Eric D. Bauer6, and Jonathan S. White7,‡

  • 1Laboratory for Scientific Developments and Novel Materials, Paul Scherrer Institut, 5232 Villigen, Switzerland
  • 2XMaS, UK-CRG, European Synchrotron Radiation Facility, Boîte Postale 220, F-38043 Grenoble Cedex, France
  • 3Oliver Lodge Laboratory, Department of Physics, University of Liverpool, Oxford Street, Liverpool L69 7ZE, United Kingdom
  • 4Laboratory for Synchrotron Radiation, Paul Scherrer Institut, 5232 Villigen, Switzerland
  • 5Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
  • 6Condensed Matter and Magnet Science, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
  • 7Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, 5232 Villigen, Switzerland

  • *nicolas.gauthier4@gmail.com
  • Present address: Condensed Matter Group, National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA.
  • jonathan.white@psi.ch

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Issue

Vol. 96, Iss. 6 — 1 August 2017

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