High magnetic field x-ray diffraction study of the 
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 phase of solid oxygen: Absence of giant magnetostriction

Using the experimental capability of the novel X-ray diffraction instrument available at the 25 Tesla Florida Split Coil Magnet at the NHMFL, Tallahassee we present an extensive investigation on the magnetostriction of polycrystalline AlFe2B2. The magnetostriction was measured near the ferromagnetic transition temperature (Curie temperature TC = 280 K, determined via DC magnetization measurements), namely, at 250, 290, and 300 K. AlFe2B2 exhibits an anisotropic change in lattice parameters as a function of magnetic field near the Curie temperature, and a monotonic variation as a function of applied field has been observed, i.e., the c-axis increases significantly while the a-and b-axes decrease with the increasing field in the vicinity of TC, irrespective of the measurement temperature. The volume magnetostriction decreases with decreasing temperature and changes its sign across TC. Density functional theory calculations for the non-polarized and spin-polarized (ferromagnetic) models confirm that the observed changes in lattice parameters due to spin polarization are consistent with the experiment. The relationships for magnetostriction are estimated based on a simplified Landau model that agrees well with the experimental results.

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Magnetostriction of AlFe2B2 in high magnetic fields

Sharma

Kovalev

Rebar

et al. 2021

Phys. Rev. Materials

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Solid and Liquid Oxygen under Ultrahigh Magnetic Fields

Nomura

Matsuda

Kobayashi

2022

Oxygen

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Oxygen is a unique molecule that possesses a spin quantum number S=1. In the condensed phases of oxygen, the delicate balance between the antiferromagnetic interaction and van der Waals force results in the various phases with different crystal structures. By applying ultrahigh magnetic fields, the antiferromagnetic coupling between O2 molecules breaks, and novel high-field phases can appear. We have investigated the physical properties of condensed oxygen under ultrahigh magnetic fields and have found that the stable crystal structure of solid oxygen changes around 100 T. Even in liquid oxygen, we observed a strong acoustic attenuation, which indicates the fluctuation of local molecular arrangements. These results demonstrate that magnetic fields can modulate the packing structure of oxygen through spin-lattice coupling. Our study implies the possibility of controlling oxygen-related (bio-)chemical processes by using an external magnetic field.

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High magnetic field x-ray diffraction study of the α phase of solid oxygen: Absence of giant magnetostriction

Cited by 2 publications

References 22 publications

Magnetostriction of AlFe2B2 in high magnetic fields

Magnetostriction of AlFe2B2 in high magnetic fields

Solid and Liquid Oxygen under Ultrahigh Magnetic Fields

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