Volume 61, Number 4, February 2003
|Page(s)||534 - 540|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 February 2003|
Quantum phase transition in to collinear non–spin-flop state in magnetic field: A neutron diffraction study
Petersburg Nuclear Physics Institute RAS - Gatchina, 188300 St. Petersburg, Russia
2 CEA-Grenoble, DRFMC/SPSMS/MDN - 38042 Grenoble Cedex 9, France
3 Institut Laue-Langevin - BP 156, 38042 Grenoble Cedex 9, France
4 Institute for Solid State and Semiconductor Physics BYAS - 220072 Minsk, Belarus
Accepted: 4 December 2002
In the external field applied to the tetragonal antiferromagnet , a transition is discovered from the phase with orthogonal antiferromagnetic spin subsystems along and to the phase with collinear spins, which are inclined about to the field. This phase is shown to be due to the interplane pseudodipolar interaction, and transforms into the spin-flop phase asymptotically at very high field. The discovered phase transition is of first order, if the field is along , or , and becomes of second order if the field is slightly inclined to these axes. It holds at and is a quantum one, with the transition field being the critical point and the angle between two subsystems below the critical point being the order parameter.
PACS: 75.25.+z – Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source X-ray scattering, etc.) / 75.30.Kz – Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.) / 75.50.Ee – Antiferromagnetics
© EDP Sciences, 2003
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