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Correlated Atomic Motion and Spin-Ordering in bcc 3He

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Abstract

We propose a new way to treat the ordering of nuclear magnetism of solid 3He. We argue that the magnetic interaction arises indirectly as a consequence of correlated zero-point motion of the ions. This motion lowers the energy of the ground state, and results in a coherent state of oscillating electric dipoles. Distortion of the electronic wavefunctions leads to hyperfine magnetic interactions with the nuclear spin. Our model describes both the modification of the phonon spectra, localized modes (“vacancies”) and the nuclear magnetic ordering of bcc 3He using a single parameter, the correlated zero-point energy E 0. The model yields correctly both the u2d2 symmetry of the ordered phase and the volume dependence of the magnetic interaction. We calculate the magnetic excitations in the u2d2 phase, which compare well with the measured specific-heat, free energy and entropy. We also give a description of the nature of the high-field phase (HFP), and calculate some properties of the magnetic phase diagram.

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Authors and Affiliations

  1. Department of Physics, University of Illinois at Urbana-Champaign, 1110 Green St., Urbana, Illinois, 61801, U.S.A

    N. Gov

  2. Department of Materials and Interfaces, The Weizmann Institute of Science, P.O. Box 26, Rehovot, 76100, Israel

    N. Gov

  3. Physics Department, Technion-Israel Institute of Technology, Haifa, 32000, Israel

    E. Polturak

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  1. N. Gov
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Gov, N., Polturak, E. Correlated Atomic Motion and Spin-Ordering in bcc 3He. Journal of Low Temperature Physics 128, 55–85 (2002). https://doi.org/10.1023/A:1016347425877

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