Magnetostriction of AlFe2B2 in high magnetic fields

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