Thermodynamic properties of the XX model in a chain with a period two and three coupling

J. Abad ()

The European Physical Journal B: Condensed Matter and Complex Systems, 2007, vol. 55, issue 4, 429-437

Abstract: The exact solutions for the energy spectrum of the XX model with a periodic coupling and an external transverse magnetic field h are obtained. The diagonalization procedure is discussed, and analytical and numerical solutions are given. Using the solutions for period-two coupling, the free energy, entropy, and specific heat are calculated as functions of temperature and applied transverse external magnetic field. Their expressions show that below a particular value v and above a value u of the magnetic field |h|, the entropy and the specific heat vanish exponentially in the low temperature limit. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2007

Keywords: 05.70.Fh Phase transitions: general studies; 05.70.Jk Critical point phenomena; 75.10.Pq Spin chain models (search for similar items in EconPapers)
Date: 2007
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DOI: 10.1140/epjb/e2007-00065-y

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