Role of the Fermi surface for the pressure-tuned nematic transition in the BaFe2As2 family

Elena Gati, Li Xiang, Sergey L. Bud'ko, and Paul C. Canfield
Phys. Rev. B 100, 064512 – Published 15 August 2019

Abstract

The tetragonal-to-orthorhombic phase transition at Ts, which precedes the antiferromagnetic phase transition at TN in many iron-based superconductors, is considered one of the manifestations of electronic nematic order. By constructing temperature-pressure phase diagrams of pure and Co-doped BaFe2As2, we study the relation of Ts and TN under pressure p. Our data disclose two qualitatively different regimes in which ΔT=TsTN either increases or decreases with p. We provide experimental evidence that the transition between the two regimes may be associated with sudden changes of the Fermi surface topology. Therefore, our results not only support the electronic origin of the structural order, but also emphasize the importance of details of the Fermi surface for the evolution of nematic order under pressure.

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  • Received 2 July 2019
  • Revised 30 July 2019

DOI:https://doi.org/10.1103/PhysRevB.100.064512

©2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Elena Gati, Li Xiang, Sergey L. Bud'ko, and Paul C. Canfield

  • Ames Laboratory, US Department of Energy, Iowa State University, Ames, Iowa 50011, USA and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA

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Issue

Vol. 100, Iss. 6 — 1 August 2019

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