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Weak itinerant magnetic phases of La2Ni7

J. M. Wilde, A. Sapkota, W. Tian, S. L. Bud'ko, R. A. Ribeiro, A. Kreyssig, and P. C. Canfield
Phys. Rev. B 106, 075118 – Published 8 August 2022

Abstract

La2Ni7 is an intermetallic compound that is thought to have itinerant magnetism with small moment (0.15μB/Ni) ordering below 65 K. A recent study of single crystal samples by Ribeiro et al. [Phys. Rev. B 105, 014412 (2022)] determined detailed anisotropic HT phase diagrams and revealed three zero-field magnetic phase transitions at T161.0 K, T256.5 K, and T342 K. In that study only the highest temperature phase is shown to have a clear ferromagnetic component. Here we present a single crystal neutron diffraction study determining the propagation vector and magnetic moment direction of the three magnetically ordered phases, two incommensurate and one commensurate, as a function of temperature. The higher temperature phases have similar, incommensurate propagation vectors, but with different ordered moment directions. At lower temperatures, the magnetic order becomes commensurate with magnetic moments along the c direction as part of a first-order magnetic phase transition. We find that the low-temperature commensurate magnetic order is consistent with a proposal from earlier DFT calculations.

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  • Received 23 March 2022
  • Revised 19 July 2022
  • Accepted 21 July 2022

DOI:https://doi.org/10.1103/PhysRevB.106.075118

©2022 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

J. M. Wilde1,2, A. Sapkota1,2, W. Tian3, S. L. Bud'ko1,2, R. A. Ribeiro1,2, A. Kreyssig1,2,4, and P. C. Canfield1,2

  • 1Ames Laboratory, U.S. DOE, Iowa State University, Ames, Iowa 50011, USA
  • 2Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
  • 3Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  • 4Institute for Experimental Physics 4, Ruhr-Universität Bochum, 44801 Bochum, Germany

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Issue

Vol. 106, Iss. 7 — 15 August 2022

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