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arXiv 0912.4376cond-mat.mtrl-scicond-mat.str-el
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NMR研究LiCuVO $_4$的高场磁相

NMR study of the high-field magnetic phase of LiCuVO$_4$

N. Buttgen, W. Kraetschmer, L. E. Svistov, L. A. Prozorova, A. Prokofiev

摘要:

本文报道了准一维反铁磁$S=1/2$链状铜酸盐LiCuVO $_4$的NMR研究,重点是最近在外加磁场$H > H_{\rm c2}$($μ_0H_{\rm c2} \approx 7.5$ T)中观察到的高场自旋调制相.测量了$^7$ Li和$^{51}$ V从有序态到顺磁态转变前后的NMR谱。结果表明,在0. 6 K $ < T < T_{\rm N}$的低温下,{ \bf ab}-平面内相邻链的自旋之间存在铁磁相互作用,形成自旋调制的磁结构.最佳拟合提供了相邻{ \bf ab}-平面的自旋之间的相互取向是随机的证据。对于升高的温度$T_{\rm N} < T \lesssim 15$ K,短程磁序至少发生在NMR实验的特征时间尺度上。

英文摘要:

We report on NMR studies of the quasi--1D antiferromagnetic $S=1/2$ chain cuprate LiCuVO$_4$, focusing on the high--field spin--modulated phase observed recently in applied magnetic fields $H > H_{\rm c2}$ ($μ_0H_{\rm c2} \approx 7.5$ T). The NMR spectra of $^7$Li and $^{51}$V around the transition from the ordered to the paramagnetic state were measured. It is shown that the spin--modulated magnetic structure forms with ferromagnetic interactions between spins of neighboring chains within the {\bf ab}--plane at low temperatures 0.6 K $ < T < T_{\rm N}$. The best fit provides evidence that the mutual orientation between spins of neighboring {\bf ab}--planes is random. For elevated temperatures $T_{\rm N} < T \lesssim 15$ K, short--range magnetic order occurs at least on the characteristic time scale of the NMR experiment.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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