Phase diagram of S=12 two-leg XXZ spin-ladder systems

Keigo Hijii, Atsuhiro Kitazawa, Kiyohide Nomura

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39 Citations (Scopus)


We investigate the ground-state phase diagram of the S=12 two-leg XXZ spin-ladder system with an isotropic interchain coupling. In this model, there is the Berezinskii-Kosterlitz-Thouless transition which occurs at the XY-Haldane and XY-rung singlet phase boundaries. It was difficult to determine the transition line using traditional methods. We overcome this difficulty using the level spectroscopy method combined with the twisted boundary condition method, and we check the consistency. We find out that the phase boundary between XY phase and Haldane phase lies on Δ=0 line. And we show that there exist two different XY phases, which we can distinguish investigating a XX correlation function.

Original languageEnglish
Article number014449
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number1
Publication statusPublished - 2005

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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