Quantum phase transitions and dimensional reduction in antiferromagnets with interlayer frustration
Quantum phase transitions and dimensional reduction in antiferromagnets with interlayer frustration
复制标题
层间挫败反铁磁体的量子相变和降维
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
M. Vojta
中科院分区：
文献类型：
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作者：
Oliver Rosch;M. Vojta
对于具有完全受挫的层间相互作用的磁体，我们认为，从顺磁到反铁磁基态的量子相变，由压力或磁场驱动，是渐近三维的，由于相互作用产生的非受挫层间耦合。然而，相关的交叉尺度是微小的，这样的二维行为发生在实验相关的低温制度。在压力驱动的情况下，相变可能分裂，在这种情况下，与层间键序相关的伊辛对称性在磁性发生之前被破坏。本文讨论了我们的结果与最近有关Ba，Cu，Si，O，6的实验结果的关系。
For magnets with a fully frustrated interlayer interaction, we argue that the quantum phase transitions from a paramagnetic to an antiferromagnetic ground state, driven by pressure or magnetic field, are asymptotically three dimensional, due to interaction-generated nonfrustrated interlayer couplings. However, the relevant crossover scale is tiny, such that two-dimensional behavior occurs in an experimentally relevant low-temperature regime. In the pressure-driven case the phase transition may split, in which case an Ising symmetry related to interlayer bond order is broken before magnetism occurs. We discuss the relation of our results to recent experiments on $mathrm{Ba}mathrm{Cu}{mathrm{Si}}_{2}{mathrm{O}}_{6}$.