Fermi Surface Nesting in CeIn3 Revealed by Neutron Spectroscopy

ORAL

Abstract

We report a high-resolution neutron spectroscopy study of the archetypal heavy fermion material CeIn3 that exhibits an antiferromagnetic ground state below TN = 10.1 K with a commensurate propagation vector k = (½, ½, ½). Previous neutron results with moderate energy resolution reported a substantial spin gap of 1.3 meV, which suggest large magnetic anisotropy even though this is not supported by the observed bulk properties. Our results unambiguously demonstrate that CeIn3 does not exhibit a spin gap. Instead, we find that the spin waves disperse quasi-vertically up to almost 1 meV. When such as steep dispersion is probed with not sufficiently high resolution, this will result in an artifact in the neutron spectrum that looks like a spin gap, and thus our findings are in agreement with previous reports. More interestingly, the steep spin wave dispersion of CeIn3 reveals truly long-range magnetic exchange interactions and suggests Fermi surface nesting.

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Presenters

  • Marc Janoschek

    Los Alamos National Laboratory, Los Alamos Natl Lab, MPA-CMMS, Los Alamos National Lab

Authors

  • Marc Janoschek

    Los Alamos National Laboratory, Los Alamos Natl Lab, MPA-CMMS, Los Alamos National Lab

  • David Fobes

    Los Alamos Natl Lab, MPA-CMMS, Los Alamos National Lab

  • Filip Ronning

    MPA-CMMS, Los Alamos National Laboratory, Los Alamos Natl Lab, Los Alamos National Laboratory, Condensed Matter and Magnetic Science Group, Los Alamos National Laboratory, Condensed Matter and Magnet Science Group, Los Alamos National Laboratory

  • Eric Bauer

    MPA-CMMS, Los Alamos National Laboratory, Los Alamos National Laboratory, Los Alamos Natl Lab, Condensed Matter and Magnetic Science Group, Los Alamos National Laboratory, Los Alamos National Lab, Condensed Matter and Magnet Science Group, Los Alamos National Laboratory

  • Cristian Batista

    Department of Physics and Astronomy, Univ of Tennessee, Knoxville, Univ of Tennessee, Knoxville, Department of Physics and Astronomy, The University of Tennessee, University of Tennessee, Physics, University of Tennessee, The University of Tennessee, Department of Phys., Univ. of Tennessee, U. Tennessee, Knoxville, University of Tennessee, Knoxville