Magnetic-field induced spin-Peierls instability in strongly frustrated quantum spin lattices.
Magnetic-field induced spin-Peierls instability in strongly frustrated quantum spin lattices.
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DOI：
10.1103/physrevlett.93.107206
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发表时间：
2003-12
影响因子：
8.6
通讯作者：
J. Richter;O. Derzhko;J. Schulenburg
中科院分区：
文献类型：
--
作者：
J. Richter;O. Derzhko;J. Schulenburg
对于一类受挫的反铁磁自旋晶格（特别是方形kagom<e:1>和kagom<e:1>晶格），我们讨论了最近发现的精确本征态对晶格抗畸变稳定性的影响。这些本征态由嵌入在铁磁环境中的独立局域磁子组成，并在强磁场中成为基态。对于适合局域磁振子结构的适当的晶格畸变，可以精确地计算出磁能的降低，并与导致自旋-佩尔斯晶格不稳定的原子位移成正比。由于这些局域态只存在于高磁场中，这种不稳定性可能是由磁场驱动的。讨论了自旋-佩尔斯跃迁的滞后现象。
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.