Finite-size effects in layered magnetic systems

Details Finite-size effects in layered magnetic systems Finite-size effects in layered magnetic systems

1996-10-09

arxiv.org/abs/cond-mat/9610079v1

Phys. Rev. B55, 6429 (1997)

Physics

Condensed Matter

Statistical Mechanics

13 pages, Revtex, with 9 eps figures

Scientific paper

10.1103/PhysRevB.55.6429

Thermal and magnetic effects in a system consisting of thin layers of coupled Ising spins with $S=1/2$ and $S=1$ are considered. The specific heat and the correlation length display maxima at two different temperatures. It is discussed in what sense these maxima can be interpreted as a finite-size rounding of a thermodynamic singularity associated with a phase transition. The connection with ordinary, extraordinary and special surface phase transitions is made. In $2D$, the surface critical exponents are calculated from conformal invariance. The bulk and surface finite-size scaling of the order parameter profiles at the transition points is discussed. In $2D$, an exact scaling function for the profiles is suggested through conformal invariance arguments for the (extra)ordinary transition.

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