Physics

Data on physics described by V.M. Kalita et al

  2008 NOV 24 - (VerticalNews.com) -- According to a study from Kiev, Ukraine, "The magnetic properties of the antiferromagnetic state induced in the Van Vleck magnet by longitudinal magnetic field are described within thermodynamic Landau approach. We consider the case of a magnet with a single-ion anisotropy of ''easy-plane'' type and ion spin S=1."

  "It is shown that quantum phase transition to antiferromagnetic state is related to appearance of the spontaneous spin polarization parallel to an ''easy-plane.'' Application of longitudinal field gives rise to the tilt of sublattice magnetizations toward the field direction and increase in their modula as well. Linear field dependence of the net magnetization (similar to that observed in the classical antiferromagnets) can be attained only in the limit of large interion ''easy-plane'' anisotropy comparable to the single-ion one. We also study peculiarities of the induced magnetostriction of the Van Vleck antiferromagnet and show that: (i) like the magnetization, magnetostriction has a singularity at the phase-transition point and (ii) the sign of magnetostriction can be reversed during the magnetization process due to the influence of the spin tilt," wrote V.M. Kalita and colleagues.

  The researchers concluded: "An attempt is made to qualitatively compare the obtained results with the available experimental data."

  Kalita and colleagues published the results of their research in Physical Review B (Magnetization and magnetostriction of Van Vleck antiferromagnets with magnetic anisotropy of ''easy-plane'' type. Physical Review B, 2008;78(10):4415).

  For additional information, contact V.M. Kalita, National Academy Science Ukraine, Institute Physics, Prospect Nauki 46, UA-03680 Kiev, Ukraine.

  The publisher of the journal Physical Review B can be contacted at: American Physical Society, One Physics Ellipse, College Pk, MD 20740-3844, USA.

  Keywords: Electronics, Magnetic Field, Magnetostriction, Physics.

  This article was prepared by VerticalNews Physics editors from staff and other reports. Copyright 2008, VerticalNews Physics via VerticalNews.com.