Magnetic fluctuations at a field-induced quantum phase transition.
Magnetic fluctuations at a field-induced quantum phase transition.
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DOI：
10.1103/physrevlett.99.237203
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发表时间：
2007-12
影响因子：
8.6
通讯作者：
Oliver Stockert;M. Enderle;H. Löhneysen
中科院分区：
文献类型：
--
作者：
Oliver Stockert;M. Enderle;H. Löhneysen
本文报道了CeCu_（5.8）Au_（0.2）磁量子相变的非弹性中子散射研究。的数据可以更好地描述自旋密度波的情况下，而不是由一个本地的量子临界点，而后者的情况下被证明是适用于零场浓度调谐的量子相变CeCu 6-xAux x=0.1。这构成了直接的微观证据的量子涨落谱的差异，在磁量子临界点由不同的调谐参数驱动。
We report an inelastic neutron-scattering study at the field-induced magnetic quantum phase transition of CeCu5.8Au0.2. The data can be described better by the spin-density-wave scenario than by a local quantum critical point, while the latter scenario was shown to be applicable to the zero-field concentration-tuned quantum phase transition in CeCu6-xAux for x=0.1. This constitutes direct microscopic evidence for a difference in the quantum fluctuation spectra at a magnetic quantum critical point driven by different tuning parameters.