Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session T00: Poster Session III (1pm-4pm PST)
1:00 PM,
Thursday, March 9, 2023
Room: Exhibit Hall (Forum Ballroom)
Sponsoring
Unit:
APS
Abstract: T00.00032 : Nonmagnetic disorder effect to the FFLO phase in layered organic superconductor κ-(BEDT-TTF)2Cu(NCS)2*
Presenter:
Shiori Sugiura
(Tohoku University)
Authors:
Shiori Sugiura
(Tohoku University)
Shusaku Imajo
(The Institute for Solid State Physics, Univ.of Tokyo)
Motoi Kimata
(Institute for Materials Research, Tohoku University)
Shinya Uji
(National Institute for Materials Science)
Taichi Terashima
(National Institute for Materials Science)
Koichi Kindo
(The Institute for Solid State Physics, Univ.of Tokyo)
Takahiko Sasaki
(Institute for Materials Research, Tohoku University)
In this study, we have performed the resistance and magnetic torque measurements to reveal the disorder effects on the FFLO phase of a highly two dimensional organic superconductor κ-(BEDT-TTF)2Cu(NCS)2 (κ-NCS, Tc = 10.2 K). Non-magnetic disorders are introduced into the Cu(NCS)2 molecules (not BEDT-TTF conducting layers) by X-ray irradiation, which is known as an effective method to control the local random potential quantitatively.
We have precisely measured the magnetic field dependence of the resistance and the magnetic torque. In the parallel field, both Tc and the irreversibility field of the torque curves giving the lower limit of Hc2 decrease with increasing the irradiation time. From these results, the detailed high-field superconducting phase diagram of the disorder introduced κ-NCS is determined
*This work was supported by KAKENHI 22K13995, 22H01176, 22H04466.
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