Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session F10: Advances in Scanned Probe Microscopy 3: Scanning Probes Spectroscopic Techniques
8:00 AM–10:12 AM,
Tuesday, March 3, 2020
Room: 108
Sponsoring
Unit:
GIMS
Chair: Stephen Jesse, University of Tennessee
Abstract: F10.00005 : Role of steps on Pb atomic-layer superconductivity
Presenter:
Yudai Sato
(Institute for Solid State Physics, The University of Tokyo)
Authors:
Yudai Sato
(Institute for Solid State Physics, The University of Tokyo)
Fumikazu Oguro
(Institute for Solid State Physics, The University of Tokyo)
Kanta Asakawa
(Institute for Solid State Physics, The University of Tokyo)
Takashi Uchihashi
(International Center for Materials Nanoarchitectonics, National Institute for Material Science)
Yukio Hasegawa
(Institute for Solid State Physics, The University of Tokyo)
Pb monolayers on a Si(111) substrate is known to form various superconducting phases. Using scanning tunneling microscopy (STM), we found a√3×√43 superconductivity phase still remains on narrow terraces (< 150 nm) even under out-of-plane magnetic fields above its critical magnetic field (190 mT). In addition, on a striped incommensurate (SIC) phase formed on a 1.1 degrees tilted vicinal Si(111) substrate, where 15 nm-narrow terraces covers the whole surface, we observed suppression of the superconductivity breaking against out-of-plane magnetic field. Our results open up the possibility of creating superconducting materials whose the critical magnetic fields of all directions are enhanced in a macroscopic level.
References:
[1] T. Zhang et al., Nature Phys., 6, 104 (2010)
[2] S. Yoshizawa et al., Phys. Rev. Lett. 113, 247004 (2014)
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