Phys. Rev. B 67, 134428 (2003) [6 pages]Thermodynamic properties of spin ladders with cyclic exchangeReceived 30 October 2002; revised 20 December 2002; published 28 April 2003 By high-temperature series expansion and exact complete diagonalization the magnetic susceptibility χ(T) and the specific heat C(T) of a two-leg S=1/2 ladder with cyclic (four-spin) exchange are computed. Both methods yield convincing results for not too small temperatures. We find that a small amount of cyclic exchange influences the thermodynamic properties significantly. Our results can serve as reliable basis for an efficient analysis of experimental data. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.67.134428
DOI:
10.1103/PhysRevB.67.134428
PACS:
75.40.Cx, 05.10.-a, 75.10.Jm, 75.50.Ee
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