Publication Date

8-1-2019

Department

Ames Laboratory; Physics and Astronomy

Campus Units

Ames Laboratory, Physics and Astronomy

OSTI ID+

1557784

Report Number

IS-J 9998

DOI

10.1103/PhysRevB.100.064512

Journal Title

Physical Review B

Volume Number

100

Issue Number

6

First Page

064512

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=Ts−TN 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.

DOE Contract Number(s)

AC02-07CH11358

Language

en

Department of Energy Subject Categories

75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Publisher

Iowa State University Digital Repository, Ames IA (United States)

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