Spherical neutron polarimetry under high pressure for a multiferroic delafossite ferrite

Noriki Terada (), Navid Qureshi, Laurent C. Chapon and Toyotaka Osakabe
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Noriki Terada: National Institute for Materials Science
Navid Qureshi: Institut Laue Langevin
Laurent C. Chapon: Institut Laue Langevin
Toyotaka Osakabe: Japan Atomic Energy Agency

Nature Communications, 2018, vol. 9, issue 1, 1-9

Abstract: Abstract The analysis of three-dimensional neutron spin polarization vectors, using a technique referred to as spherical neutron polarimetry (SNP), is a very powerful means of determining complex magnetic structures in magnetic materials. However, the requirement to maintain neutrons in a highly polarized state has made it difficult to use this technique in conjunction with extreme experimental conditions. We have developed a high pressure cell made completely of nonmagnetic materials and having no effect on neutron polarizations. Herein, we report the first SNP analyses under high pressure up to 4.0 GPa in the magnetoelectric multiferroic delafossite CuFeO2. This study also determined the complex spiral magnetic structures in these pressure-induced phases, by measuring the full neutron polarization matrix. The results presented herein demonstrate that the SNP measurements are feasible under high pressure conditions, and that this method is a useful approach to study pressure-induced physical phenomena.

Date: 2018
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DOI: 10.1038/s41467-018-06737-6

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