Finite-size scaling in thin Fe/Ir(100) layers

Details Finite-size scaling in thin Fe/Ir(100) layers Finite-size scaling in thin Fe/Ir(100) layers

1998-04-18

arxiv.org/abs/cond-mat/9804201v1

Phys. Rev. Lett. 80, 4783-4786 (1998)

Physics

Condensed Matter

Statistical Mechanics

Latex, 4 pages, with 2 figures, to appear in Phys. Rev. Lett.

Scientific paper

10.1103/PhysRevLett.80.4783

The critical temperature of thin Fe layers on Ir(100) is measured through M\"o{\ss}bauer spectroscopy as a function of the layer thickness. From a phenomenological finite-size scaling analysis, we find an effective shift exponent lambda = 3.15 +/- 0.15, which is twice as large as the value expected from the conventional finite-size scaling prediction lambda=1/nu, where nu is the correlation length critical exponent. Taking corrections to finite-size scaling into account, we derive the effective shift exponent lambda=(1+2\Delta_1)/nu, where Delta_1 describes the leading corrections to scaling. For the 3D Heisenberg universality class, this leads to lambda = 3.0 +/- 0.1, in agreement with the experimental data. Earlier data by Ambrose and Chien on the effective shift exponent in CoO films are also explained.

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