2007/03/10 by Olena Gomonay, Helen V. Gomonay, В. М. Локтев +1
Chemistry · Earth and Planetary Sciences · Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Antiferromagnetism #Chemistry #Computer science #Condensed matter physics #Crystal (programming language) #Crystal structure #Crystallography #Distortion (music) #High-pressure geophysics and materials #Lattice (music) #Magnetic and transport properties of perovskites and related materials #Materials science #Phase (matter) #Physics #Quantum mechanics #Singlet state #cond-mat.stat-mech
paper · pdf · doi:10.1103/physrevb.76.094423
published as Phys. Rev. B 76, N9, 094423 (2007) · 11 pages, 4 figures, Changes: corrected typos, reference to the recent paper is added
arxiv created 2007/03/10 · openalex publication_date 2007/09/28 · arxiv updated 2010/03/16 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
For a long time the crystal structure of the high-pressure \ensuremathε phase of solid oxygen was a mystery. The results of recent experiments have solved this riddle showing that the magnetic and crystal structures of this phase can be explained by strong exchange interactions of antiferromagnetic nature. The singlet state implemented on quaters of O2 molecules has minimal exchange energy if compared to other possible singlet states (dimers, trimers). Magnetoelastic forces that arise from the space dependence of the exchange integral give rise to transformation of 4(O2) rhombuses into almost regular quadrates. The antiferromagnetic character of exchange interactions stabilizes the distortion of the crystal lattice in the \ensuremathε phase and impedes such a distortion in the long-range \ensuremathα and \ensuremathδ phases.