Direct Determination of the Magnetic Structure of the Delta Phase of Oxygen

I. N. Goncharenko, O. L. Makarova, and L. Ulivi
Phys. Rev. Lett. 93, 055502 – Published 29 July 2004

Abstract

Simple diatomic molecules exhibit a variety of exciting physical phenomena under high pressures, including structural transitions, pressure induced metallization, and superconductivity. Oxygen is of particular interest because it carries a magnetic moment. For the first time we studied the magnetic structure in solid oxygen under very high pressure by a direct method, namely, neutron diffraction. A new type of magnetic order with ferromagnetic stacking of the antiferromagnetic O2 planes was discovered in δO2 at P=6.2GPa. We show that all structural transformations at pressures <7GPa are driven by spin interactions; therefore, high-pressure oxygen should be considered as a unique “spin-controlled crystal.”

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  • Received 21 January 2004

DOI:https://doi.org/10.1103/PhysRevLett.93.055502

©2004 American Physical Society

Authors & Affiliations

I. N. Goncharenko

  • Laboratoire Léon Brillouin C.E.A.-C.N.R.S., CEA Saclay, 91191 Gif-sur-Yvette, France

O. L. Makarova

  • Russian Research Center "Kurchatov Institute," 123182 Moscow, Russia

L. Ulivi

  • Istituto di Fisica applicata "N. Carrara," CNR, Via della Madonna del piano, I-50019 Sesto Fiorentino, Italy

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Issue

Vol. 93, Iss. 5 — 30 July 2004

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