Weak itinerant magnetic phases of La2Ni7

J. M. Wilde, A. Sapkota, W. Tian, S. L. Bud'Ko, R. A. Ribeiro, A. Kreyssig, P. C. Canfield

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

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)2469-995010.1103/PhysRevB.105.014412] determined detailed anisotropic H-T phase diagrams and revealed three zero-field magnetic phase transitions at T1∼61.0 K, T2∼56.5 K, and T3∼42 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.

Original languageEnglish
Article number075118
JournalPhysical Review B
Volume106
Issue number7
DOIs
StatePublished - Aug 15 2022

Funding

Work at Ames Laboratory was supported by the U. S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences & Engineering. Ames Laboratory is operated for the U. S. Department of Energy by Iowa State under Contract No. DE-AC02-07CH11358. A portion of this research used resources at the High Flux Isotope Reactor, a U. S. Department of Energy, Office of Science User Facility operated by Oak Ridge National Laboratory.

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