Physics: Study Results From V.V. Hovhannisyan And Colleagues In The

STUDY RESULTS FROM V.V. HOVHANNISYAN AND COLLEAGUES IN THE AREA OF PHYSICS PUBLISHED

Science Letter
July 8, 2008

"The Ising approximation is proposed for the Heisenberg model with
two- and three-spin exchange interactions on a zigzag ladder placed
in a strong magnetic field. Using the transfer matrix technique the
magnetization is calculated and compared with the results obtained
in the dynamical recursive approach," investigators in Yerevan,
Armenia report (see also Physics).

"Magnetization plateaus are found at m = 0 and m = 1/3 with the
two- and three-spin exchanges. The magnetic susceptibility in
small and large zigzag ladders for various exchange parameters and
temperatures is also analyzed. As temperature decreases the magnetic
susceptibility versus magnetic field shows the formation of spin
pseudogaps and transformation from double to four peak structure,"
wrote V.V. Hovhannisyan and colleagues.

The researchers concluded: "Small clusters also exhibit characteristic
features of large thermodynamic systems."

Hovhannisyan and colleagues published their study in Physics Letters a
(Antiferromagnetic model and magnetization plateaus on the zigzag
ladder with two- and three-site exchanges. Physics Letters a,
2008;372(19):3363-3368).

For additional information, contact V.V. Hovhannisyan, Yerevan Physics
Institute, Dept. of Theoret Physics, Alikhanian Brothers 2, Yerevan
375036, Armenia.

The publisher of the journal Physics Letters a can be contacted at:
Elsevier Science BV, PO Box 211, 1000 AE Amsterdam, Netherlands.

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