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arXiv 2302.05145cond-mat.supr-con
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Sn$_{0.06}$Cr$_3$Te$_4$:一种斯格明子超导体

Sn$_{0.06}$Cr$_3$Te$_4$: A Skyrmion Superconductor

Shubham Purwar, Anumita Bose, Achintya Low, Satyendra Singh, R. Venkatesh, Awadhesh Narayan, Setti Thirupathaiah

AI总结:

本研究通过Sn插层在铁磁层状斯格明子体系Cr$_3$Te$_4$中成功引入超导性,同时观察到超导、磁性与拓扑霍尔效应,提出了一类新的拓扑量子材料。

摘要:

从基础科学和潜在技术应用的角度来看,拓扑超导体是一类令人兴奋的量子材料。在此,我们报告了通过Sn插层,在铁磁层状斯格明子系统Cr$_3$Te$_4$中成功引入超导性,其转变温度低于$T_c$$\approx$3.5 K。我们在该系统中同时观察到了几种有趣的物理性质,如超导性、磁性和拓扑霍尔效应。尽管磁性和迈斯纳效应是各向异性的,但从面内电阻率($ρ_{\it{bc}}$)观察到的超导性在$H\parallel \it{bc}$和$H\parallel \it{a}$之间几乎是各向同性的,这表明该系统的超导性和磁性由不同的传导电子通道负责,我们的自旋分辨DFT计算也支持这一点。我们发现超导Sn$_{0.06}$Cr$_{3}$Te$_4$的载流子密度比母体Cr$_3$Te$_4$高出两个数量级。在$T_c$附近注意到比热的跳跃,体积分数为33\\%,证实了Sn$_{0.06}$Cr$_{3}$Te$_4$中的体超导性。除了引入超导性外,还注意到通过Sn插层对拓扑霍尔性质的调控。我们在斯格明子晶格中观察到超导性,提出了一类新的拓扑量子材料。

英文摘要:

Topological superconductors are an exciting class of quantum materials from the point of view of the fundamental sciences and potential technological applications. Here, we report on the successful introduction of superconductivity in a ferromagnetic layered skyrmion system Cr$_3$Te$_4$, obtained by the Sn intercalation, below a transition temperature of $T_c$$\approx$3.5 K. We observe several interesting physical properties, such as superconductivity, magnetism, and the topological Hall effect, simultaneously in this system. Despite the magnetism and Meissner effects being anisotropic, the superconductivity observed from the in-plane electrical resistivity ($ρ_{\it{bc}}$) is nearly isotropic between $H\parallel \it{bc}$ and $H\parallel \it{a}$, suggesting separate channels of conduction electrons responsible for the superconductivity and magnetism of this system, which is also supported by our spin-resolved DFT calculations. We identify two orders of higher carrier density in superconducting Sn$_{0.06}$Cr$_{3}$Te$_4$ than the parent Cr$_3$Te$_4$. A jump in the specific heat is noticed around the $T_c$ with a volume fraction of 33\%, confirming the bulk superconductivity in Sn$_{0.06}$Cr$_{3}$Te$_4$. In addition to the introduction of superconductivity, tuning of topological Hall properties is noticed with Sn intercalation. Our observation of superconductivity in a skyrmion lattice brings up a new class of topological quantum materials.

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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