拓扑绝缘体上双共线反铁磁有序FeTe单层膜界面超导电性的证据
Evidence for interfacial superconductivity in a bi-collinear antiferromagnetically ordered FeTe monolayer on a topological insulator
摘要：
铁基化合物中高温超导性的发现[1，2]引发了对超导性和磁性之间相互作用的大量研究[3]，最近，通过界面效应提高转变温度[4]。人们普遍认为，最佳超导性的出现与长程反铁磁（AFM）有序的抑制密切相关，尽管由于缺乏原子空间分辨率的数据，这种关系的精确微观图像仍然难以捉摸[1][5-7]。在这里，我们提出了一个自旋极化扫描隧道光谱（SP-STS）的研究，铁碲$_{1-x}$硒$_x$（x = 0，0.5）薄膜生长在原型Bi基块体拓扑绝缘体。令人惊讶的是，我们发现在费米能级处的能隙表明，与非超导FeTe体化合物相比，生长在Bi 2 Te 3衬底上的一个单胞薄FeTe层的超导相关性高达Tc ~ 6 K [8]。此外，SP-STS揭示了能隙空间共存的双共线原子力显微镜秩序。这一发现为铁基超导体中竞争有序的理论研究以及拓扑绝缘体和超导层异质结构中奇异相的实验研究开辟了新的视角。
英文摘要：
The discovery of high-temperature superconductivity in Fe-based compounds [1,2] has triggered numerous investigations on the interplay between superconductivity and magnetism [3] and, more recently, on the enhancement of transition temperatures through interface effects [4]. It is widely believed that the emergence of optimal superconductivity is intimately linked to the suppression of long-range antiferromagnetic (AFM) order, although the exact microscopic picture of this relationship remains elusive [1] due to the lack of data with atomic spatial resolution [5-7]. Here, we present a spin-polarized scanning tunneling spectroscopy (SP-STS) study of ultrathin FeTe$_{1-x}$Se$_x$ (x = 0, 0.5) films grown on prototypical Bi-based bulk topological insulators. Surprisingly, we find an energy gap at the Fermi level indicating superconducting correlations up to Tc ~ 6 K for one unit cell thin FeTe layers grown on Bi2Te3 substrates, in contrast to the non-superconducting FeTe bulk compound [8]. Moreover, SP-STS reveals that the energy gap spatially coexists with bicollinear AFM order. This finding opens novel perspectives for theoretical studies of competing orders in Fe-based superconductors as well as for experimental investigations of exotic phases in heterostructures of topological insulators and superconducting layers.
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