Quasi-two-dimensional superconductivity from dimerization of atomically ordered AuTe2Se4/3 cubes. Issue 1 (December 2017)

• Record Type: Journal Article
• Authors: Guo, J.; Chen, X.; Jia, X.; Zhang, Q.; Liu, N.; Lei, H.; Li, S.; Gu, L.; Jin, S.; Chen, X.
• Is Part Of: Nature communications. Volume 8:Issue 1(2017)
• Page Start: 1
• Page End: 9
• Publication Date: 2017-12
• Subjects: Biology -- Periodicals; Physical sciences -- Periodicals; 505
• DOI: 10.1038/s41467-017-00947-0
• Languages: English
• ISSNs: 2041-1723

Abstract

Abstract The emergent phenomena such as superconductivity and topological phase transitions can be observed in strict two-dimensional (2D) crystallinematters. Artificial interfaces and one atomic thickness layers are typical 2D materials of this kind. Although having 2D characters, most bulky layered compounds, however, do not possess these striking properties. Here, we report quasi-2D superconductivity in bulky AuTe2 Se4/3, where the reduction in dimensionality is achieved through inducing the elongated covalent Te–Te bonds. The atomic-resolution images reveal that the Au, Te, and Se are atomically ordered in a cube, among which are Te–Te bonds of 3.18 and 3.28 Å. The superconductivity at 2.85 K is discovered, which is unraveled to be the quasi-2D nature owing to the Berezinsky–Kosterlitz–Thouless topological transition. The nesting of nearly parallel Fermi sheets could give rise to strong electron–phonon coupling. It is proposed that further depleting the thickness could result in more topologically-related phenomena. Emergent phenomena often appear in crystals in the two-dimensional limit but are rare in bulky compounds. Here, Guo et al. report a quasi-two-dimensional superconductivity in a bulk material AuTe2 Se4/3 at 2.85 K, potentially owing to a topological transition.