Authors: Rainer W. Kühne
This PhD thesis examines the thermodynamical properties of spin-1/2 Heisenberg chains which are coupled to Einstein phonons. One result of this study is that these spin-phonon systems undergo a phase transition similar to a spin-Peierls transition (cf. Physical Review B 60 (1999) 12125-12133 and Physical Review B 65 (2002) 144438). Another result is that in the undimerized phase the critical exponent nu depends on both the phonon frequency and the spin-phonon coupling constant. This means that these spin-phonon systems change the universality class continuously with the spin-phonon coupling (cf. arXiv: cond-mat/9912150v1).
Comments: 107 pages, dissertation, Dr. rer. nat. obtained from the University of Dortmund on 19 July 2001
[v1] 14 Mar 2011
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