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Temperature dependence of the initial ac permeability (a) and magnetization curves (b) of . Vertical arrows in the panel (a) indicate the determined characteristic temperatures , , , , and . The arrows in the panel (b) indicate, the magnetization process with increasing and decreasing fields . These magnetization curves are measured after zero-field heating from .
X-ray powder diffraction profiles of at various temperatures for cooling (a) and heating (b) processes from in zero magnetic field. and denote the Miller indices for the cubic -type and four-layered orthorhombic structures, respectively.
Temperature dependence of the lattice parameters (a) and the unit cell volumes (b) for in a zero field. The open and closed symbols show the data for heating and cooling processes, respectively. The dashed lines indicate the thermal hysteresis with varying fraction of the four-layered orthorhombic structure phase among , , , and .
X-ray powder diffraction profiles of in magnetic fields up to at (a), (b), and (c). and denote the Miller for the cubic -type and four-layered orthorhombic structures, respectively.
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