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arXiv 1606.08147cond-mat.supr-con
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Tl基Six-CuO2-Layered铜酸盐中高温超导与反铁磁性的新相互作用:205 Tl和63 Cu-NMR探针

Novel Interplay between High-Tc Superconductivity and Antiferromagnetism in Tl-based Six-CuO2-Layered Cuprates : 205 Tl and 63 Cu-NMR Probes

Hidekazu Mukuda, Nozomu Shiki, Naoki Kimoto, Mitsuharu Yashima, Yoshio Kitaoka, Kazuyasu Tokiwa, Akira Iyo

摘要:

本文报道了六层($n$ =6)高$T_c$超导(SC)铜酸盐TlBa $_2$ Ca $_5$ Cu $_6$ O $_{14+δ}$(Tl 1256)在$T_c\sim$ 100 K下的$^{63}$ Cu和$^{205}$ Tl-NMR研究,结果表明,在低于$T_{\rm N}\sim$ 170 K时发生反铁磁(AFM)有序.在该化合物中,四个欠掺杂的内部CuO $_2$平面($n$(IP)=4)夹在两个外平面(OP)之间是AFM有序开始的原因,而几乎最佳掺杂的OP负责体SC的开始。指出,在晶胞内的面外磁相互作用的增加导致Tl 1245的$T_{\rm N}\sim$ 45 K,其中$n$(IP)= 3对于TI 1256,$n$(IP)=4,增加至$\sim$ 170 K。值得注意的是,$T_{\rm N}$的显著增加和IP的AFM矩并没有带来$T_c$的任何减少,因为对于具有几乎最佳掺杂的OP的两种化合物,$T_c\sim 100$ K都得以保持。我们强调了以下事实:即使在多层结构中,$n\ge5$的SC顺序也主要由长程面内SC相关性主导,其对$T_{\rm N}$的大小和IP处的AFM矩或IP之间的AFM相互作用不敏感。这些结果表明,当IP和OP之间的电荷不平衡显着大时,SC和AFM订单之间的一种新的相互作用。

英文摘要:

We report $^{63}$Cu- and $^{205}$Tl-NMR studies on six-layered ($n$=6) high-$T_c$ superconducting (SC) cuprate TlBa$_2$Ca$_5$Cu$_6$O$_{14+δ}$ (Tl1256) with $T_c\sim$100 K, which reveal that antiferromagnetic (AFM) order takes place below $T_{\rm N}\sim$170 K. In this compound, four underdoped inner CuO$_2$ planes ($n$(IP)=4) sandwiched by two outer planes (OPs) are responsible for the onset of AFM order, whereas the nearly optimally-doped OPs responsible for the onset of bulk SC. It is pointed out that an increase in the out-of-plane magnetic interaction within an intra-unit-cell causes $T_{\rm N}\sim$ 45 K for Tl1245 with $n$(IP)=3 to increase to $\sim$170 K for Tl1256 with $n$(IP)=4. It is remarkable that the marked increase in $T_{\rm N}$ and the AFM moments for the IPs does not bring about any reduction in $T_c$, since $T_c\sim 100$ K is maintained for both compounds with nearly optimally doped OP. We highlight the fact that the SC order for $n\ge5$ is mostly dominated by the long-range in-plane SC correlation even in the multilayered structure, which is insensitive to the magnitude of $T_{\rm N}$ and the AFM moments at the IPs or the AFM interaction among the IPs. These results demonstrate a novel interplay between the SC and AFM orders when the charge imbalance between the IPs and OP is significantly large.

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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