Extrinsic and Intrinsic Anomalous Metallic States in Transition Metal Dichalcogenide Ising Superconductors

• DOI: 10.1021/acs.nanolett.1c01426
• Publication Date: 2021-08-30T18:52:13Z
• Authors: Ying Xing; Pu Yang; Jun Ge; Jiaojie Yan; Jiawei Luo; Haoran Ji; Zeyan Yang; Yongjie Li; Zijia Wang; Yanzhao Liu; Feng Yang; Ping Qiu; Chuanying Xi; Mingliang Tian; Yi Liu; Xi Lin; Jian Wang
• Keywords: Pauli exclusion principle

The metallic ground state in two-dimensional (2D) superconductors has attracted much attention but is still under intense scrutiny. Especially, the measurements ultralow temperature region are challenging for 2D due to sensitivity external perturbations. In this work, resistance saturation induced by noise, named as "extrinsic anomalous state", observed transition metal dichalcogenide (TMD) superconductor 4Ha-TaSe2 nanodevices. However, with further decreasing temperature, credible evidence of intrinsic obtained adequately filtering radiation. Our work indicates that at temperatures can be experimentally revealed quantum crystalline TMD superconductors. Besides, Ising superconductivity ultrahigh in-plane critical field (Bc2//) going beyond Pauli paramagnetic limit (Bp) detected 4Ha-TaSe2, from one-unit-cell device bulk situation, which might weak coupling between TaSe2 sub-monolayers.