arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1408.6576cond-mat.str-elcond-mat.mtrl-sci
收藏

高关联电子化合物CeCu $_{4}Ga的短程磁关联

Short-range magnetic correlations in the highly-correlated electron compound CeCu$_{4}Ga

B. G. Ueland, C. F. Miclea, K. Gofryk, Y. Qiu, F. Ronning, R. Movshovich, E. D. Bauer, J. S. Gardner, J. D. Thompson

摘要:

我们给出了重电子化合物CeCu $_{4}$ Ga的实验结果,结果表明它在低至$T = 0.1$ K的温度下具有短程磁关联。我们的中子散射数据表明,尽管比热在$T^{*} =1.2$ K处有一个峰值,但没有出现长程磁序的证据。相反,发生磁漫散射,其对应于跨两个单位单元发生的短程磁相关。比热在$T\sim0$ K时保持很大,导致索末菲系数为$γ_{0} = 1.44(2)$ J/mol-K $^{2}$,低于$T^{*}$时,电阻率遵循$T^{2}$行为,交流磁化率变得与温度无关。在非弹性中子散射数据中可以看到以$E_{\rm{c}}=0.24(1)$ meV的能量转移为中心的磁峰,该磁峰在磁场下向更高的能量移动并变宽。我们讨论了在低温下大的比热,磁波动和短程磁相关性的共存,并将我们的结果与具有自旋液体行为的材料进行比较。

英文摘要:

We present experimental results for the heavy-electron compound CeCu$_{4}$Ga which show that it possesses short-range magnetic correlations down to a temperature of $T = 0.1$ K. Our neutron scattering data show no evidence of long-range magnetic order occurring despite a peak in the specific heat at $T^{*} =1.2$ K. Rather, magnetic diffuse scattering occurs which corresponds to short-range magnetic correlations occurring across two unit cells. The specific heat remains large as $T\sim0$ K resulting in a Sommerfeld coefficient of $γ_{0} = 1.44(2)$ J/mol-K$^{2}$, and, below $T^{*}$, the resistivity follows $T^{2}$ behavior and the ac magnetic susceptibility becomes temperature independent. A magnetic peak centered at an energy transfer of $E_{\rm{c}}=0.24(1)$ meV is seen in inelastic neutron scattering data which shifts to higher energies and broadens under a magnetic field. We discuss the coexistence of large specific heat, magnetic fluctuations, and short-range magnetic correlations at low temperatures and compare our results to those for materials possessing spin-liquid behavior.

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。

↑