Direct observation of the logarithmic correction to Landau's equation of state at marginal dimension
- 1 March 1982
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 25 (5) , 3292-3297
- https://doi.org/10.1103/physrevb.25.3292
Abstract
We report precise data on the equation of state near the Curie point of two uniaxial ferromagnets, LiTb and Dy-ethylsulfate, obtained by a superconducting quantum-interference-device magnetometer. Analyzing the critical behavior of the coefficient of the third-order term in Landau's expansion of the magnetic field, the logarithmic divergence as expected from exact solutions of the renormalization-group equations is seen directly for the first time. The nonuniversal parameters describing this logarithmic singularity are compared to calculations based on the microscopic theory of Larkin and Khmel'nitzkii.
Keywords
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