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Münster 1997 – wissenschaftliches Programm

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DY: Dynamik und Statistische Physik

DY 3: Spinmodelle

DY 3.8: Vortrag

Montag, 17. März 1997, 12:15–12:30, R1

Scaling behaviour of the correlation length for the two-point correlation function in the 1D RFIM — •Adrian Lange1 and Robin Stinchcombe21Institut für Theoretische Physik, Universität Magdeburg, Postfach 4120, D-39108 Magdeburg — 2Theoretical Physics, University of Oxford, 1 Keble Road, Oxford OX1 3NP, UK

We study the general behaviour of the correlation length ξ (kT, h) for the two-point correlation function of the local fields in an Ising chain with binary distributed fields. At zero field it is shown that ξ is the same as the zero field correlation length for the spin-spin correlation function. For the field dominated behaviour of ξ we find an exponent for the power law divergence which is smaller than the exponent for the spin-spin correlation length. The entire behaviour of the correlation length can be described by a single crossover scaling function involving the new critical exponent.

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