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Aspects of the Ising Model

  • Bernard Prum
  • Jean Claude Fort
Chapter
  • 142 Downloads
Part of the Mathematical Physics Studies book series (MPST, volume 11)

Abstract

In 1920, the German physicist, Ernst Lenz, described a model designed to explain ferromagnetism. The iron atoms are situated at the vertices of a periodic lattice, and each atom behaves like a small magnet which may be oriented in a direction denoted by +1, or in the opposite direction denoted by -1. Physically, two magnets that are close to one another require less energy to be oriented in the same sense than in an opposite sense. Up to a first approximation, Lenz assumed that each atom is only sensitive to the position of the nearest atoms; up to an additive constant, the energy of a pair of atoms situated at neighboring vertices i and j could thus be written, H = - J if the two atoms have the same orientation H = + J if the two atoms have opposite orientations where J is a positive constant

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Copyright information

© Springer Science+Business Media Dordrecht 1991

Authors and Affiliations

  • Bernard Prum
    • 1
  • Jean Claude Fort
    • 1
  1. 1.Université Paris VParisFrance

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