TY - JOUR
T1 - Quasi-two-dimensional superconductivity from dimerization of atomically ordered AuTe2Se4/3 cubes
AU - Guo, J. G.
AU - Chen, X.
AU - Jia, X. Y.
AU - Zhang, Q. H.
AU - Liu, N.
AU - Lei, H. C.
AU - Li, S. Y.
AU - Gu, L.
AU - Jin, S. F.
AU - Chen, X. L.
N1 - Publisher Copyright:
© 2017 The Author(s).
PY - 2017/12/1
Y1 - 2017/12/1
N2 - The emergent phenomena such as superconductivity and topological phase transitions can be observed in strict two-dimensional (2D) crystalline matters. 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 AuTe2Se4/3, 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.
AB - The emergent phenomena such as superconductivity and topological phase transitions can be observed in strict two-dimensional (2D) crystalline matters. 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 AuTe2Se4/3, 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.
UR - http://www.scopus.com/inward/record.url?scp=85031085458&partnerID=8YFLogxK
U2 - 10.1038/s41467-017-00947-0
DO - 10.1038/s41467-017-00947-0
M3 - Article
C2 - 29021625
AN - SCOPUS:85031085458
SN - 2041-1723
VL - 8
JO - Nature Communications
JF - Nature Communications
IS - 1
M1 - 871
ER -