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arXiv 2102.10987cond-mat.str-elcond-mat.supr-con
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超导拓扑kagome金属中反常霍尔效应与电荷密度波的共存

Concurrence of anomalous Hall effect and charge density wave in a superconducting topological kagome metal

F. H. Yu, T. Wu, Z. Y. Wang, B. Lei, W. Z. Zhuo, J. J. Ying, X. H. Chen

摘要:

反常霍尔效应(AHE)是铁磁材料中最基本的物理现象之一,而在传统的超导体中是不可能出现的。在可果美超导体CsV_3Sb_5中观察到一个巨大的AHE,其转变温度为2.7K。反常霍尔电导率高达2.1 * 10^4 Ω-1 cm-1,这比在大多数铁磁金属中观察到的电导率要大。引人注目的是,AHE的出现完全遵循更高温度的电荷密度波(CDW)转变与TCDW~94 K,表明CDW状态和AHE之间的强相关性。当高压下CDW转变被完全抑制时,AHE消失。AHE的起源归因于CDW态的斜散射增强和kagome晶格产生的大Berry曲率。这些发现使CsV_3Sb_5成为研究非平凡能带拓扑、CDW和非常规超导之间相互作用的理想平台。

英文摘要:

As one of the most fundamental physical phenomena, the anomalous Hall effect (AHE) typically occurs in ferromagnetic materials but is not expected in the conventional superconductors. Here, we have observed a giant AHE in kagome superconductor CsV3Sb5 with transition temperature (Tc) of 2.7 K. The anomalous Hall conductivity reaches up to 2.1*10^4 Ω-1 cm-1 which is larger than those observed in most of the ferromagnetic metals. Strikingly, the emergence of AHE exactly follows the higher-temperature charge-density-wave (CDW) transition with TCDW ~ 94 K, indicating a strong correlation between the CDW state and AHE. Furthermore, AHE disappears when the CDW transition is completely suppressed at high pressure. The origin for AHE is attributed to enhanced skew scattering in CDW state and large Berry curvature arose from the kagome lattice. These discoveries make CsV3Sb5 as an ideal platform to study the interplay among nontrivial band topology, CDW and unconventional superconductivity.

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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