Density of Zeros on the Lee-Yang circle obtained from magnetization data of a two-dimensional Ising ferromagnet

Details Density of Zeros on the Lee-Yang circle obtained from magnetization data of a two-dimensional Ising ferromagnet Density of Zeros on the Lee-Yang circle obtained from magnetization data of a two-dimensional Ising ferromagnet

1998-11-11

arxiv.org/abs/cond-mat/9811157v1

Physics

Condensed Matter

Statistical Mechanics

4 figures. Phys. Rev. Lett. (in press)

Scientific paper

10.1103/PhysRevLett.81.5644

In order to provide an experimental access to the statistical theory of Lee and Yang (1952) the density function g(theta) of zeros on the Lee-Yang circle has been determined for the first time by analyzing isothermal magnetization data, m(H), of the Ising ferromagnet FeCl2 in axial magnetic fields, H, at temperatures 34 < T < 99K. The validity of our approach is demonstrated by the perfect agreement of magnetic specific heat data as calculated from g(theta) and m(H) via Maxwells relation, respectively. Moreover, the correct in-plane exchange constant of FeCl2 emerges from the series expansion of m(H) involved in the analysis.

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