Type-II Ising Superconductivity and Anomalous Metallic State in Macro-Size Ambient-Stable Ultrathin Crystalline Films
- 25 June 2020
- journal article
- research article
- Published by American Chemical Society (ACS) in Nano Letters
- Vol. 20 (8), 5728-5734
- https://doi.org/10.1021/acs.nanolett.0c01356
Abstract
Recent emergence of two-dimensional (2D) crystalline superconductors has provided a promising platform to investigate novel quantum physics and potential applications. To reveal essential quantum phenomena therein, ultralow temperature transport investigation on high-quality ultrathin superconducting films is critically required, although it has been quite challenging experimentally. Here, we report a systematic transport study on the ultrathin crystalline PdTe2 films grown by molecular beam epitaxy (MBE). Interestingly, a new type of Ising superconductivity in 2D centrosymmetric materials is revealed by the detection of large in-plane critical field more than 7 times the Pauli limit. Remarkably, in a perpendicular magnetic field, we provide solid evidence of an anomalous metallic state characterized by the resistance saturation at low temperatures with high-quality filters. The robust superconductivity with intriguing quantum phenomena in the macro-size ambient-stable ultrathin PdTe2 films remains almost the same for 20 months, showing great potentials in electronic and spintronic applications.Keywords
Funding Information
- Ministry of Science and Technology of the People's Republic of China (2015CB921000, 2015CB921100, 2017YFA0303300, 2018YFA0305600, 2018YFA0307100)
- Natural Science Foundation of Beijing Municipality (Z180010)
- China Postdoctoral Science Foundation (2019M650290)
- Beijing Innovation Center for Future Chip
- National Natural Science Foundation of China (11674188, 11774008, 11774193, 11790311, 11874035, 11888101, 51788104)
- Chinese Academy of Sciences (XDB28000000)
This publication has 37 references indexed in Scilit:
- Quantum phase transitions in highly crystalline two-dimensional superconductorsNature Communications, 2018
- Highly crystalline 2D superconductorsNature Reviews Materials, 2016
- Evidence for two-dimensional Ising superconductivity in gated MoS 2Science, 2015
- Superconductivity protected by spin–valley locking in ion-gated MoS2Nature Physics, 2015
- Ising pairing in superconducting NbSe2 atomic layersNature Physics, 2015
- Quantum Griffiths singularity of superconductor-metal transition in Ga thin filmsScience, 2015
- Metallic ground state in an ion-gated two-dimensional superconductorScience, 2015
- Two-Dimensional Superconductor with a Giant Rashba Effect: One-Atom-Layer Tl-Pb Compound on Si(111)Physical Review Letters, 2015
- Magnetoresistance Measurements of a Superconducting Surface State of In-Induced and Pb-Induced Structures on Si(111)Physical Review Letters, 2013
- Macroscopic Superconducting Current through a Silicon Surface Reconstruction with Indium Adatoms:Physical Review Letters, 2011