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Iron-Selenide Phenomenology in Superconducting Pr4Fe2As2Te0.88O4


Horio, M; Sutter, Denys; Dennler, N; Choi, J; Fischer, Mark; Chang, J (2019). Iron-Selenide Phenomenology in Superconducting Pr4Fe2As2Te0.88O4. arXiv.org 1910.01639, University of Zurich.

Abstract

The unified modeling of iron-based high-temperature superconductors has been complicated by different phenomenologies in the iron-pnictides and iron-chalcogenides. Here we use x-ray diffraction and angle-resolved photoemission spectroscopy to investigate the lattice and electronic properties of the Pr4Fe2As2Te0.88O4 (Tc=25 K) superconductor. The crystal structure undergoes a high-temperature (Ts=250 K) orthorhombic transition with no apparent magnetic transition. Further, we find the Fermi surface to consist of zone-corner electron pockets only. In addition to superconductivity, a second electronic instability -- evidenced by a spectroscopic gap below Tg≈2×Tc -- is found. Both, the electronic structure and the sequence of transitions, resemble what has been reported in monolayer and bulk FeSe. Our results thus provide a direct link between the iron-pnictide and iron-chalcogenide families of superconductors.

Abstract

The unified modeling of iron-based high-temperature superconductors has been complicated by different phenomenologies in the iron-pnictides and iron-chalcogenides. Here we use x-ray diffraction and angle-resolved photoemission spectroscopy to investigate the lattice and electronic properties of the Pr4Fe2As2Te0.88O4 (Tc=25 K) superconductor. The crystal structure undergoes a high-temperature (Ts=250 K) orthorhombic transition with no apparent magnetic transition. Further, we find the Fermi surface to consist of zone-corner electron pockets only. In addition to superconductivity, a second electronic instability -- evidenced by a spectroscopic gap below Tg≈2×Tc -- is found. Both, the electronic structure and the sequence of transitions, resemble what has been reported in monolayer and bulk FeSe. Our results thus provide a direct link between the iron-pnictide and iron-chalcogenide families of superconductors.

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Additional indexing

Item Type:Working Paper
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2019
Deposited On:07 Jan 2020 11:57
Last Modified:07 Jan 2020 11:59
Series Name:arXiv.org
ISSN:2331-8422
OA Status:Green
Related URLs:https://arxiv.org/abs/1910.01639

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