I. A. Trojan, A. G. Gavriliuk, V. A. Sarkisyan, I. S. Lyubutin, R. Ruffer, O. Leupold, A. Barla, B. Doyle, A. I. Chumakov, “Transition from the antiferromagnetic to a nonmagnetic state in FeBO<nobr>$_3$</nobr> under high pressure”, Pis'ma v Zh. Èksper. Teoret. Fiz., 2001, Volume 74, Issue 1,Pages <nobr>26

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Transition from the antiferromagnetic to a nonmagnetic state in FeBO$_3$ under high pressure

I. A. Trojan^a, A. G. Gavriliuk^a, V. A. Sarkisyan^b, I. S. Lyubutin^b, R. Ruffer^c, O. Leupold^cd, A. Barla^c, B. Doyle^c, A. I. Chumakov^c

^a Institute for High Pressure Physics, Russian Academy of Sciences
^b Institute of Cristallography Russian Academy of Sciences, Moscow
^c European Synchrotron Radiation Facility
^d I. Institut fur Experimentalphysik, Universitat Hamburg

Abstract: A $^{57}$FeBO$_3$ single crystal is studied by the nuclear forward scattering (NFS) method. The NFS time spectra from $^{57}$Fe nuclei are recorded at room temperature under high pressures up to $50$ GPa in a diamond anvil cell. In the pressure interval $0<p<44$ GPa, the magnetic field H$^{Fe}$ at the $^{57}$Fe nuclei is found to increase nonlinearly, reaching a maximum value of $481$ T at $p=44$ GPa. As the pressure increases further and reaches the point $p=46$ GPa, the field H$^{Fe}$ abruptly drops to zero, indicating that a transition from the antiferromagnetic to a non-magnetic state occurs in the crystal. In the pressure interval $0<p<46$ GPa, the magnetic moments of the iron ions lie in the (111) basal plane of the crystal. Several possible mechanisms of magnetic collapse are discussed.

PACS: 75.25.+z, 76.80.+y, 81.40.Vw

Received: 25.05.2001