Detection of a superconducting phase in a two-atom layer of hexagonal Ga film grown on semiconducting GaN(0001)

The recent observation of superconducting state at atomic scale has motivated the pursuit of exotic condensed phases in two-dimensional (2D) systems. Here we report on a superconducting phase in two-monolayer crystalline Ga films epitaxially grown on wide band-gap semiconductor GaN(0001). This phase...

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Bibliographic Details
Published in:arXiv.org 2015-01
Main Authors: Zhang, Huimin, Sun, Yi, Li, Wei, Peng, Junping, Can-Li, Song, Xing, Ying, Zhang, Qinghua, Guan, Jiaqi, Li, Zhi, Zhao, Yanfei, Ji, Shuaihua, Wang, Lili, He, Ke, Chen, Xi, Gu, Lin, Ling, Langsheng, Tian, Mingliang, Li, Lian, Xie, X C, Liu, Jianping, Yang, Hui, Qi-Kun Xue, Wang, Jian, Ma, Xucun
Format: Article
Language:English
Subjects:
Anisotropy
Epitaxial growth
Gallium nitrides
Superconductivity
Transition temperature
Online Access:Get full text
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Summary:The recent observation of superconducting state at atomic scale has motivated the pursuit of exotic condensed phases in two-dimensional (2D) systems. Here we report on a superconducting phase in two-monolayer crystalline Ga films epitaxially grown on wide band-gap semiconductor GaN(0001). This phase exhibits a hexagonal structure and only 0.552 nm in thickness, nevertheless, brings about a superconducting transition temperature Tc as high as 5.4 K, confirmed by in situ scanning tunneling spectroscopy, and ex situ electrical magneto-transport and magnetization measurements. The anisotropy of critical magnetic field and Berezinski-Kosterlitz-Thouless-like transition are observed, typical for the 2D superconductivity. Our results demonstrate a novel platform for exploring atomic-scale 2D superconductor, with great potential for understanding of the interface superconductivity.
ISSN:2331-8422
DOI:10.48550/arxiv.1403.5936