The magnetocaloric effect is studied at the transition to saturation in the antiferromagnetic spin-1/2 Heisenberg model on the simplest two-dimensional lattices, namely the square and the triangular lattice. Numerical results are presented for the entropy which are consistent with identical universal properties. However, the absolute values of the entropy are bigger on the geometrically frustrated triangular lattice than on the non-frustrated square lattice, indicating that frustration improves the magnetocaloric properties.
Physica B Condensed Matter
- Pub Date:
- May 2006
- Condensed Matter - Strongly Correlated Electrons;
- Condensed Matter - Statistical Mechanics
- 2 pages, 2 figures included, to appear in Physica B (proceedings of SCES'05)