High-pressure electronic phase diagrams in FeSe1-xTex

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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: L54.00010 : High-pressure electronic phase diagrams in FeSe_1-xTe_x

10:36 AM–10:48 AM Live

Abstract

Presenter:

Kiyotaka Mukasa
(Department of Advanced Materials Science, The University of Tokyo)

Authors:

Kiyotaka Mukasa
(Department of Advanced Materials Science, The University of Tokyo)

Kohei Matsuura
(Department of Advanced Materials Science, The University of Tokyo)

Mingwei Qiu
(Department of Advanced Materials Science, The University of Tokyo)

Mikihiko Saito
(Department of Advanced Materials Science, The University of Tokyo)

Yuichi Sugimura
(Department of Advanced Materials Science, The University of Tokyo)

Muku Otani
(Department of Advanced Materials Science, The University of Tokyo)

Kousuke Ishida
(Department of Advanced Materials Science, The University of Tokyo)

Yugo Onishi
(Department of Applied Physics, The University of Tokyo)

Yuta Mizukami
(Department of Advanced Materials Science, The University of Tokyo)

Kenichiro Hashimoto
(Department of Advanced Materials Science, The University of Tokyo)

Jun Gouchi
(Institute for Solid State Physics, The University of Tokyo)

Reiji Kumai
(Institute of Materials Structure Science, High Energy Accelerator Research Organization)

Yoshiya Uwatoko
(Institute for Solid State Physics, The University of Tokyo)

Takasada Shibauchi
(Department of Advanced Materials Science, The University of Tokyo)

FeSe has attracted much attention because it has a nonmagnetic nematic order. When selenium is substituted by the isovalent element, sulfur, a nematic quantum critical point without magnetism appears. In this respect, FeSe-based materials have been a unique platform for studying the relationship between the nematic phase and the superconductivity. However, in FeSe_1-xS_x, it has been reported that the superconducting properties abruptly change at the nematic end point (x = 0.17) and therfore understanding the role of the nematic fluctuations in superconductivity is complicated.
In this study, we focus on FeSe_1-xTe_x in which selenium is substituted by tellurium. We have synthesized bulk single crystals of FeSe_1-xTe_x (0 < x < 0.55) by using the chemical vapor transport method. The temperature dependence of the electrical resistivity was measured on the FeSe_1-xTe_x crystals under pressure up to 8 GPa. As a result, we have established the three-dimensional electronic phase diagram; temperature against pressure and Te-substitution. In the obtained phase diagram, the superconducting dome emerges close to the nematic phase and far from the magnetic phase, implying that the nematic fuctuations can enhance superconducting transition temperature in this system.

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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

Abstract: L54.00010 : High-pressure electronic phase diagrams in FeSe1-xTex

Presenter:

Authors:

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Abstract: L54.00010 : High-pressure electronic phase diagrams in FeSe_1-xTe_x