Unique quantum metallic state in the titanium sesquioxide heterointerface superconductor
Abstract
The emergence of quantum metallic state marked by a saturating finite electrical resistance in the zero-temperature limit in a variety of two-dimensional superconductors injects an exciting momentum to the realm of heterostructure superconductivity. Despite much research efforts over last few decades, there is not yet a general consensus on the nature of this unexpected quantum metal. Here, we report the observation of a unique quantum metallic state within the hallmark of Bose-metal in the titanium sesquioxide heterointerface superconductor TiO/GaN. Remarkably, the quantum bosonic metallic state continuously tuned by a magnetic field in the vicinity of the two-dimensional superconductivity-metal transition persists in the normal phase, indicating the existence of composite bosons formed by electron Cooper pairs even in the normal phase. Our findings provide a distinct evidence for electron pairing in the normal phase of heterointerface superconductors, and shed fresh light on the pairing nature underlying heterointerface superconductivity.
Keywords
Cite
@article{arxiv.2211.04035,
title = {Unique quantum metallic state in the titanium sesquioxide heterointerface superconductor},
author = {Guanqun Zhang and Yixin Liu and Zhongfeng Ning and Guoan Li and Jinghui Wang and Yueshen Wu and Lijie Wang and Huanyi Xue and Chunlei Gao and Zhenghua An and Jun Li and Jie Shen and Gang Mu and Yan Chen and Wei Li},
journal= {arXiv preprint arXiv:2211.04035},
year = {2024}
}
Comments
12 pages, 4 figures