Low temperature structural phase transition and incommensurate lattice modulation in the spin gap compound BaCuSi2O6
Low temperature structural phase transition and incommensurate lattice modulation in the spin gap compound BaCuSi2O6
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自旋间隙化合物 BaCuSi2O6 的低温结构相变和不通约晶格调制
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
I. Fisher
中科院分区：
文献类型：
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作者：
E. C. Samulon;Z. Islam;S. Sebastian;P. B. Brooks;M. K. McCourt;J. Ilavsky;I. Fisher
从有序状态中分离出量子顺磁状态。最近的实验探索了与相边界接近QCP有关的临界指数，表明可以用离域三重态的玻色-爱因斯坦凝聚(BEC)来描述相变，最低测量温度为30mK[5，6]。不幸的是，这种材料的大自旋间隙目前阻碍了对有序状态下的磁结构的直接测量。因此，对零磁fi场下低温晶体结构的详细了解就显得尤为重要，因为这将对高fi场磁相变的本质有重要的影响。
separates the quantumparamagnetic regime from the ordered state. Recent ex-periments probing the critical exponent associated withthe approach of the phase boundary towards the QCPindicate that it is possible to describe the phase tran-sition in terms of Bose-Einstein Condensation (BEC) ofdelocalized triplets down to the lowest measured temper-atures of 30 mK [5, 6]. Unfortunately, the large spin gapof this material currently precludes direct measurementof the magnetic structure in the ordered state. For thisreason it is particularly important to have a detailed un-derstanding of the low-temperature crystal structure inzero magnetic field, since this will have important conse-quences for the nature of the high-field magnetic phasetransition.To date, the crystal structure of BaCuSi