In-plane electronic anisotropy resulted from ordered magnetic moment in iron-based superconductors

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In-plane electronic anisotropy resulted from ordered magnetic moment in iron-based superconductors

S.-F. Wu, W.-L. Zhang, V. K. Thorsmølle, G. F. Chen, G. T. Tan, P. C. Dai, Y. G. Shi, C. Q. Jin, T. Shibauchi, S. Kasahara, Y. Matsuda, A. S. Sefat, H. Ding, P. Richard, and G. Blumberg

Phys. Rev. Research 2, 033140 – Published 24 July 2020

Abstract

We study the in-plane electronic anisotropy in the parent compounds of several families of Fe-based superconductors ( ${BaFe}_{2} {As}_{2}, {EuFe}_{2} {As}_{2}$ , NaFeAs, LiFeAs, FeSe, and LaFeAsO) by polarization-resolved Raman scattering. We measure intensity of the fully symmetric $c$ -axis vibration of As atom mode in the $X Y$ scattering geometry and notice that the mode's intensity is significantly enhanced below the magnetostructural transition only for compounds showing magnetic ordering. In particular, we find that the intensity ratio of this As phonon in the $X Y$ vs. $X X$ scattering geometries is proportional to the square of the ordered magnetic moment. We relate this As phonon intensity enhancement below the Néel temperature in iron pnictides to in-plane electronic anisotropy induced by the collinear spin-density wave order.

Received 5 December 2017
Revised 30 June 2020
Accepted 7 July 2020

DOI:https://doi.org/10.1103/PhysRevResearch.2.033140

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Antiferromagnetism Electron-phonon coupling Superconductivity

Pnictides Unconventional superconductors

Raman spectroscopy

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

S.-F. Wu^1,*, W.-L. Zhang^1,†, V. K. Thorsmølle¹, G. F. Chen², G. T. Tan³, P. C. Dai⁴, Y. G. Shi², C. Q. Jin², T. Shibauchi⁵, S. Kasahara⁶, Y. Matsuda⁶, A. S. Sefat⁷, H. Ding², P. Richard⁸, and G. Blumberg ^1,9,‡

¹Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA.
²Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
³Center for Advanced Quantum Studies and Department of Physics, Beijing Normal University, Beijing 100875, China
⁴Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA
⁵Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba 277-8561, Japan
⁶Department of Physics, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
⁷Materials Science & Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
⁸Institut quantique, Université de Sherbrooke, 2500 Boulevard de l'Université, Sherbrooke, Québec J1K 2R1, Canada
⁹National Institute of Chemical Physics and Biophysics, 12618 Tallinn, Estonia

^*sw666@physics.rutgers.edu
^†Present address: Department of Engineering and Applied Sciences, Sophia University, 7-1 Kioi-cho, Chiyoda-ku, Tokyo 102-8554, Japan.
^‡girsh@physics.rutgers.edu

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Vol. 2, Iss. 3 — July - September 2020

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