Quantum Heisenberg Antiferromagnet on Frustrated Bilayer Lattice in Strong Magnetic Fields |
| O. Derzhko a, J. Richter b and T. Krokhmalskii a
a Institute for Condensed Matter Physics, NASU, 1 Svientsitskii Street, L'viv-11, 79011, Ukraine b Institut fűr Theoretische Physik, Universität Magdeburg, P.O. Box 4120, 39016 Magdeburg, Germany |
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| Received: 9 07 2007; |
| In the present paper we consider the low-temperature thermodynamic properties of the quantum Heisenberg antiferromagnet on the frustrated bilayer lattice in strong magnetic fields.Under certain conditions the isolated localized magnon states (singlets on vertical bonds;simultaneous occupation of neighboring vertical bonds is forbidden) are the ground states which dominate thermodynamics and induce a behavior inherent in the well known model of hard squares on a square lattice.We focus on magnetic properties discussing the magnetization and the susceptibility of the spin model. |
| DOI: 10.12693/APhysPolA.113.433 PACS numbers: 75.10.Jm, 75.45.+j, 75.50.Ee |