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The giant magneto-volume effect in solid oxygen

DOI: 10.1088/0953-8984/17/23/L03 DOI Help

Authors: K. Katsumata (SPring-8/RIKEN) , S. Kimura (KYOKUGEN) , U. Staub (Paul Scherrer Inst) , Y. Narumi (KYOKUGEN) , Yoshi Tanaka (SPring-8/RIKEN) , S. Shimomura (Keio University) , T. Nakamura (SPring-8/JASRI) , S. W. Lovesey (Diamond Light Source) , T. Ishikawa (SPring-8/RIKEN) , H. Kitamura (SPring-8/RIKEN)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Physics: Condensed Matter , VOL 17 (23) , PAGES L235-L239

State: Published (Approved)
Published: May 2005

Abstract: X-ray diffraction measurements on a-solid oxygen under an applied magnetic field are reported. The volume of alpha-solid O-2 is found to expand with increasing magnetic field: the lattice constants a and b elongate, while the lattice constant c and the angle are almost independent of the magnetic field. The maximum volume expansion observed is about 1% under a 7.5 T field, which is a giant effect compared to the volume change observed in ferromagnetic metals, such as Fe, Co and Ni. This finding indicates that a spin-dependent intermolecular potential is essential in determining the structure of alpha-solid O-2. The experimental results conform with predictions based on a magneto-elastic interaction derived from an antiferromagnetic exchange coupling of O-2 spins.

Journal Keywords: Antiferromagnetism; Cobalt; Coupling; Ferromagnetic Materials; Iron; Lattice Parameters; Magnetic Fields; Oxygen; Potentials; Solids; Spin; X-Ray Diffraction

Subject Areas: Physics

Technical Areas: Theoretical Physics

Added On: 26/04/2010 14:18

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