Magnetic-Field Induced Spin-Peierls Instability in Strongly Frustrated Quantum Spin Lattices

Johannes Richter, Oleg Derzhko, and Jörg Schulenburg
Phys. Rev. Lett. 93, 107206 – Published 3 September 2004

Abstract

For a class of frustrated antiferromagnetic spin lattices (in particular, the square-kagomé and kagomé lattices) we discuss the impact of recently discovered exact eigenstates on the stability of the lattice against distortions. These eigenstates consist of independent localized magnons embedded in a ferromagnetic environment and become ground states in high magnetic fields. For appropriate lattice distortions fitting to the structure of the localized magnons the lowering of magnetic energy can be calculated exactly and is proportional to the displacement of atoms leading to a spin-Peierls lattice instability. Since these localized states are present only for high magnetic fields, this instability might be driven by magnetic-field. The hysteresis of the spin-Peierls transition is also discussed.

  • Figure
  • Received 5 December 2003

DOI:https://doi.org/10.1103/PhysRevLett.93.107206

©2004 American Physical Society

Authors & Affiliations

Johannes Richter1, Oleg Derzhko1,*, and Jörg Schulenburg2

  • 1Institut für Theoretische Physik, Universität Magdeburg, P.O. Box 4120, D-39016 Magdeburg, Germany
  • 2Universitätsrechenzentrum, Universität Magdeburg, P.O. Box 4120, D-39016 Magdeburg, Germany

  • *On leave of absence from the Institute for Condensed Matter Physics, National Academy of Sciences of Ukraine, 1 Svientsitskii Street, L’viv-11, 79011, Ukraine

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Vol. 93, Iss. 10 — 3 September 2004

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