Effect of metamaterial engineering on the superconductive properties of ultrathin layers of NbTiN
Abstract
The electronic transport and optical properties of high quality multilayers of NbTiN/AlN with ultrathin NbTiN layers were characterized. The anisotropy of the dielectric function of the multilayers confirmed their hyperbolic metamaterial properties. The superconductive transition temperature, Tc, of these engineered superconductors was enhanced up to 32% compared to the Tc of a single ultrathin NbTiN layer while the resistivity per NbTiN layer remained unchanged. We have demonstrated that this Tc increase can be attributed to enhanced electron–electron interaction in superconducting hyperbolic metamaterials. The measured critical fields are high and have an anomalous temperature dependence on the direction perpendicular to the magnetic field. These results demonstrate that the metamaterial engineering approach can be used to enhance Hc2.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Aug 17, 2021
- Source ID
- 10.1063/5.0057663
Entities
People
- Anne-Marie Valente-Feliciano
- David R. Beverstock
- Grace Yong
- Igor I. Smolyaninov
- Joseph C Prestigiacomo
- Michael S. Osofsky
- Vera N. Smolyaninova
- William Korzi
Organizations
- Defense Advanced Research Projects Agency
- Office of Naval Research
- Thomas Jefferson National Accelerator Facility
- Towson University
- United States Department of Energy
- United States Naval Research Laboratory
- University of Maryland