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arXiv 1503.00453cond-mat.str-el
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NMR揭示的阶梯形Kagomé反铁磁体PbCu $_3$ TeO $_7$的磁性和场循环感应效应

Magnetism and a field-cycling induced effect in staircase Kagomé antiferromagnet PbCu$_3$TeO$_7$ revealed by NMR

J. Dai, P. S. Wang, S. S. Sun, F. Pang, J. S. Zhang, X. L. Dong, G. Yue, K. Jin, J. Z. Cong, Y. Sun, Weiqiang Yu

摘要:

本文报道了阶梯形Kagomé反铁磁体PbCu_3TeO_7($T_{N1}\approx$ 36 K)单晶的$^{125}$ Te和$^{63,65}$ Cu核磁共振(NMR)研究。用Curie-Weiss拟合高温Knight位移,得到$Θ$ ~140 K的居里常数。阻挫因子f(= $Θ/T_N $)$\approx$ 4表示该系统中的中间阻挫。由高温Knight位移数据估算出$^{125}$ Te的超精细耦合常数为$^{125}A_{hf}$ = -67 kOe/ $μ_B$,表明Kagomé层间存在较强的层间耦合.在$T$ = 2 K时,我们发现两种类型的零场NMR信号。一个没有依赖于历史上的字段处理,这是一致的,从不同的内部超精细领域的不等价的铜网站的铜NMR信号。另一个是只看到一个磁场循环过程后,这是一致的畴壁贡献在这个受挫的反铁磁体。

英文摘要:

We report $^{125}$Te and $^{63,65}$Cu nuclear magnetic resonance (NMR) studies on single crystals of staircase Kagomé antiferromagnet PbCu3TeO7 ($T_{N1}\approx$ 36 K). A Curie constant as large as $Θ$~140 K is obtained by a Curie-Weiss fitting of the high-temperature Knight shift. The frustration factor f (= $Θ/T_N $)$\approx$ 4 implies intermediate frustration in this system. From the high-temperature Knight shift data of $^{125}$Te, its hyperfine coupling constant is estimated to be $^{125}A_{hf}$ = -67 kOe/$μ_B$, which suggests a strong interlayer coupling bridging the neighboring Kagomé layers. At $T$= 2 K, we find two types of zero-field NMR signals. One has no dependence on the history of the field treatment, which is consistent with Cu NMR signals from inequivalent Cu sites with different internal hyperfine fields. The other one is only seen after a field-cycling process, which is consistent with domain wall contributions in this frustrated antiferromagnet.

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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