磁玻色-爱因斯坦凝聚中的巨介电非线性
Giant dielectric nonlinearities at a magnetic Bose-Einstein condensation
摘要：
实验研究了低维带隙量子磁体Cu $_2$ Cl $_{4}\cdot$ H $_8$ C $_4$ SO $_2$在磁场诱导的量子临界点附近的介电响应，该临界点分离了量子无序态和螺旋基态.观察到的磁电容效应源于转变的不适当的铁电性质，这本身也许是磁振子的玻色-爱因斯坦凝聚的最著名的实现之一。尽管如此，我们发现，与过渡相关的磁电容效应表现出巨大的和非常不寻常的非谐性。
英文摘要：
We experimentally investigate the dielectric response of the low-dimensional gapped quantum magnet Cu$_2$Cl$_{4}\cdot$H$_8$C$_4$SO$_2$ near a magnetic field-induced quantum critical point, which separates the quantum-disordered and helimagnetic ground states. The observed magnetocapacitive effect originates from an improper ferroelectric nature of the transition, which itself is perhaps one of the best known realizations of Bose--Einstein condensation of magnons. Despite that, we find that the magnetocapacitive effect associated with the transition exhibits huge and very unusual anharmonicities.
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