News of Science
March 22, 2009

PHYSICS;
Study data from Yerevan State University update understanding of physics

"A mixed Ising-Heisenberg spin system consisting of triangular
XXZ-Heisenberg spin clusters assembled into a chain by alternating
with Ising spins interacting to all three spins in the triangle is
considered," scientists writing in the journal Physical Review B
report.

"The exact solution of the model is given in terms of the generalized
decoration-iteration map and within the transfer-matrix
technique. Exact expressions for thermodynamic functions are derived,"
wrote D. Antonosyan and colleagues, Yerevan State University.

The researchers concluded: "Ground-state phase diagrams and
thermodynamic and magnetic properties of the system are examined."

Antonosyan and colleagues published their study in Physical Review B
(Exactly solvable Ising-Heisenberg chain with triangular
XXZ-Heisenberg plaquettes. Physical Review B, 2009;79(1):4432).

Additional information can be obtained by contacting D. Antonosyan,
Yerevan State University, Dept. of Theoret Physics, A Manoogian 1,
Yerevan 0025, Armenia.

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