The critical temperature of thin Fe layers on Ir(100) is measured through Mößbauer spectroscopy as a function of the layer thickness. From a phenomenological finite-size scaling analysis, we find an effective shift exponent λ = 3.15 ± 0.15, which is twice as large as the value expected from the conventional finite-size scaling prediction λ = 1/ν, where ν is the correlation length critical exponent. Taking corrections to finite-size scaling into account, we derive the effective shift exponent λ = (1 + 2∆1)/ν, where ∆1 describes the leading corrections to scaling. For the 3D Heisenberg universality class, this leads to λ = 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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