Abstract
In this paper, we use a new hybrid method to compute the thermodynamic behavior of the spin- Kagomé antiferromagnet under the influence of a large external magnetic field. We find a low-temperature behavior and a very low sensitivity of the specific heat to a strong external magnetic field. We display clear evidence that this low-temperature magnetothermal effect is associated with the existence of low-lying fluctuating singlets, but also that the whole picture ( behavior of and the thermally activated spin susceptibility) implies contribution of both nonmagnetic and magnetic excitations. Comparison with experiments is made.
- Received 15 July 1999
DOI:https://doi.org/10.1103/PhysRevLett.84.2953
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