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arXiv 0808.4073cond-mat.str-el
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准一维类Ising量子反铁磁体中的纵向SDW序

Longitudinal SDW order in a quasi-1D Ising-like quantum antiferromagnet

S. Kimura, M. Matsuda, T. Masuda, S. Hondo, K. Kaneko, N. Metoki, M. Hagiwara, T. Takeuchi, K. Okunishi, Z. He, K. Kindo, T. Taniyama, M. Itoh

摘要:

通过对准一维Ising类Co $^{\rm 2+}$自旋化合物BaCo $_{\rm 2}$ V $_{\rm 2}$ O $_{\rm 8}$的中子衍射测量,我们观察到在磁场中出现了一种新型的无公度有序.这种有序性与经典系统所期望的N{\' e} el型有序性有本质的不同,并且是由量子自旋链中固有的量子涨落引起的。无带隙一维量子系统的Tomonaga-Luttinger液体(TLL)性质是实现无公度有序的原因。

英文摘要:

From neutron diffraction measurements on a quasi-1D Ising-like Co$^{\rm 2+}$ spin compound BaCo$_{\rm 2}$V$_{\rm 2}$O$_{\rm 8}$, we observed an appearance of a novel type of incommensurate ordering in magnetic fields. This ordering is essentially different from the N{\' e}el-type ordering, which is expected for the classical system, and is caused by quantum fluctuation inherent in the quantum spin chain. A Tomonaga-Luttinger liquid (TLL) nature characteristic of the gapless quantum 1D system is responsible for the realization of the incommensurate ordering.

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