Robust short-range-ordered nematicity in FeSe evidenced by high-pressure NMR

P. S. Wang, P. Zhou, S. S. Sun, Y. Cui, T. R. Li, Hechang Lei, Ziqiang Wang, and Weiqiang Yu
Phys. Rev. B 96, 094528 – Published 27 September 2017

Abstract

We report high-pressure Se77 NMR studies on FeSe single crystals that reveal a prominent inhomogeneous NMR linewidth broadening upon cooling, with the magnetic field applied along the tetragonal [110] direction. The data indicate the existence of short-range-ordered, inhomogeneous electronic nematicity, which has surprisingly long time scales over milliseconds. The short-range order survives temperatures up to eight times the structural transition temperature, and remains robust against pressure, in contrast to the strong pressure-dependence of the orbital ordering, structural transition, and the ground state magnetism. Such an extended region of static nematicity in the (P,T) space of FeSe indicates an enormously large fluctuating regime, and provides fresh insights and constraints to the understanding of electronic nematicity in iron-based superconductors.

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  • Received 17 May 2017
  • Revised 20 August 2017

DOI:https://doi.org/10.1103/PhysRevB.96.094528

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

P. S. Wang1, P. Zhou1, S. S. Sun1, Y. Cui1, T. R. Li1, Hechang Lei1, Ziqiang Wang2, and Weiqiang Yu1,3,*

  • 1Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices, Renmin University of China, Beijing, 100872, China
  • 2Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, USA
  • 3Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China

  • *wqyu_phy@ruc.edu.cn

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Issue

Vol. 96, Iss. 9 — 1 September 2017

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