Bulletin of the American Physical Society
APS March Meeting 2021
Volume 66, Number 1
Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session L54: Fe-Based Superconductors: Iron Chalcogenides
8:00 AM–11:00 AM,
Wednesday, March 17, 2021
Sponsoring
Unit:
DMP
Chair: Shuolong Yang, University of Chicago
Abstract: L54.00002 : Enhancement of superconducting transition temperature in electrochemically etched FeSe/LaAlO3 films*
8:36 AM–8:48 AM
Live
Presenter:
Naoki Shikama
(University of Tokyo)
Authors:
Naoki Shikama
(University of Tokyo)
Yuki Sakishita
(University of Tokyo)
Fuyuki Nabeshima
(University of Tokyo)
Yumiko Katayama
(University of Tokyo)
Kazunori Ueno
(University of Tokyo)
Atsutaka Maeda
(University of Tokyo)
We investigated the gate voltage dependence of Tc in electrochemically etched FeSe films. The Tczero value of the etched FeSe films with low gate voltages (Vg = 2.5 and 3.3 V) reaches 46 K, which is the highest value among almost all reported values from the resistivity measurements except for the data by Ge et al (Nat. Mat. 14, 285 (2015)). Our results suggest that the origin of the increase in Tc is not electrostatic doping but rather the electrochemical reaction at the surface of the etched films [2].
[1] S. Kouno et al., Sci. Rep. 8 14731 (2018).
[2] N. Shikama et al., Appl. Phys. Express 13, 083006 (2020).
*This research was supported by JSPS KAKENHI Grant Numbers. 18H04212 and 19K14651 and by the Precise Measurement Technology Promotion Foundation (PMTP-F).
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