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VOLUME 82 (2005) | ISSUE 4 | PAGE 243
Phase Transition with Suppression of Magnetism in BiFeO3 at High Pressure
PACS: 71.27.+a, 71.30.+h, 81.40.Vw, 81.40.Tv
Abstract
Magnetic behavior of a Bi57FeO3 powdered sample was studied at high pressures by the method of nuclear forward scattering (NFS) of synchrotron radiation. The NFS spectra from 57Fe nuclei were recorded at room temperature under high pressures up to 61.4 GPa created in a diamond anvil cell. In the pressure interval 0 < P < 47 GPa, the magnetic hyperfine field H Fe at the 57Fe nuclei increased reaching a value of \sim52.5 T at 30 GPa, and then it slightly decreased to \sim49.6 T at P = 47 GPa. As the pressure was increased further, the field H Fe has abruptly dropped to zero testifying a transition from the antiferromagnetic to a nonmagnetic state (magnetic collapse). In the pressure interval 47 < P < 61.4 GPa, the value of H Fe remained zero. The field H Fe has recovered to low-pressure values during decompression.