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      Phase transitions in tetrahedral Ising lattices

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      Author
      Kabakçıoğlu, Alkan
      Advisor
      Yalabık, Cemal
      Date
      1993
      Publisher
      Bilkent University
      Language
      English
      Type
      Thesis
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      Abstract
      After a review of the Renormalization CJroup theory, the phase diagram of unisotro])ic tetrahedral Ising lattice is explored l)y the motivation gained through the recent experimental findings about SiGe alloys. Renormalization Group approcich and the mean-field R(J approximation previously pro])osed by Kinzel ¿ire used. Four different ordered pluises are olxserved. The critical expoiKMit // is Ciih’uhited using the liiUNirized t.ra.nsform<ition ¿iround the fixed points and ('om|)fii’ed with previous works. It is ('oiu'luded tluit the newly observed orderings in Si(!e superlattices are induced by surface effects.
      Keywords
      Plmse tiTinsition
      Plmse tiTinsition
      Renorm<iliz<ition Group
      Ising model
      SiGe superhittice
      Permalink
      http://hdl.handle.net/11693/17516
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      • Dept. of Physics - Master's degree 160
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