通过$^{75}$As NMR探测CaFe$_2$As$_2$单晶中的一级磁相变
强关联电子
2009-02-11 v3
摘要
我们报告了CaFeAs单晶中的As核磁共振数据。在顺磁态中，Knight位移、电场梯度和自旋-晶格弛豫率强烈依赖于温度，并在结构转变温度 K处发生不连续变化。在此温度以下，NMR谱揭示了As位点处存在与共线磁有序相关的内场。这些结果表明，CaFeAs中的结构相变和磁相变是一级的且强耦合，并且FeAs面内的电子密度对面外结构高度敏感。
引用
@article{arxiv.0808.0744,
title = {First order magnetic transition in single crystal CaFe$_2$As$_2$ detected by $^{75}$As NMR},
author = {S. -H. Baek and N. J. Curro and T. Klimczuk and E. D. Bauer and F. Ronning and J. D. Thompson},
journal= {arXiv preprint arXiv:0808.0744},
year = {2009}
}
备注
In Fig. 2, we incorrectly assigned AFM lines and quadrupole satellites. Fig.3 and the numbers in the text were corrected accordingly. This mistake has no affect on our main conclusion however