期刊
PHYSICAL REVIEW LETTERS
卷 84, 期 13, 页码 2953-2956出版社
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.84.2953
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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 magnetothermal effect is associated with the existence of low-lying fluctuating singlets, but also that the whole picture (T-2 behavior of C-v and the thermally activated spin susceptibility) implies contribution of both nonmagnetic and magnetic excitations. Comparison with experiments is made.
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