Phase diagram of a coupled tetrahedral Heisenberg model

Details Phase diagram of a coupled tetrahedral Heisenberg model Phase diagram of a coupled tetrahedral Heisenberg model

2003-01-10

arxiv.org/abs/cond-mat/0301162v2

Phys. Rev. B 67, 174401 (2003)

Physics

Condensed Matter

Statistical Mechanics

23 pages, 15 figures

Scientific paper

10.1103/PhysRevB.67.174401

The phase diagram of a coupled tetrahedral Heisenberg model is obtained. The quantum chain has a local gauge symmetry and its eigenspectrum is obtained by the composition of the eigenspectra of spin-1/2 XXZ chains with arbitrary distribution of spin-3/2 impurities. The phase diagram is quite rich with an infinite number of phases with ferromagnetic, antiferromagnetic or ferrimagnetic order. In some cases the ground state and the low lying eigenlevels of the model can be exactly calculated since they coincide with the eigenlevels of the exactly integrable XXZ chain. The thermodynamical properties of the model at low temperatures is also studied through finite-size analysis.

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