Magneto-thermodynamics of the spin-1/2 Kagome antiferromagnet

Details Magneto-thermodynamics of the spin-1/2 Kagome antiferromagnet Magneto-thermodynamics of the spin-1/2 Kagome antiferromagnet

1999-07-15

arxiv.org/abs/cond-mat/9907220v3

Phys. Rev. Lett 84, 2953 (2000)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, LaTeX 2.09 and RevTeX with 3 figures embedded in the text. Version to appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.84.2953

In this paper, we use a new hybrid method to compute the thermodynamic behavior of the spin-1/2 Kagome antiferromagnet under the influence of a large external magnetic field. We find a T^2 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 magneto-thermal effect is associated to the existence of low-lying fluctuating singlets, but also that the whole picture (T^2 behavior of Cv and thermally activated spin susceptibility) implies contribution of both non magnetic and magnetic excitations. Comparison with experiments is made.

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