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Title: Role of Fermi surface for the pressure-tuned nematic transition in the BaFe 2As 2 family

Abstract

We present that the tetragonal-to-orthorhombic phase transition at T s, which precedes the antiferromagnetic phase transition at T N 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 BaFe 2As 2, we study the relation of T s and T N under pressure p. Our data disclose two qualitatively different regimes in which ΔT = T s - T N either increases or decreases with p. Additionally, 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.

Authors:
 [1];  [1];  [1];  [1]
  1. Ames Lab. and Iowa State Univ., Ames, IA (United States)
Publication Date:
Research Org.:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; USDOE
OSTI Identifier:
1557784
Alternate Identifier(s):
OSTI ID: 1557387
Report Number(s):
IS-J-9998
Journal ID: ISSN 2469-9950; PRBMDO
Grant/Contract Number:  
AC02-07CH11358; DEAC02-07CH11358
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 100; Journal Issue: 6; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Gati, Elena, Xiang, Li, Bud'ko, Sergey L., and Canfield, Paul C. Role of Fermi surface for the pressure-tuned nematic transition in the BaFe2As2 family. United States: N. p., 2019. Web. doi:10.1103/PhysRevB.100.064512.
Gati, Elena, Xiang, Li, Bud'ko, Sergey L., & Canfield, Paul C. Role of Fermi surface for the pressure-tuned nematic transition in the BaFe2As2 family. United States. doi:10.1103/PhysRevB.100.064512.
Gati, Elena, Xiang, Li, Bud'ko, Sergey L., and Canfield, Paul C. Thu . "Role of Fermi surface for the pressure-tuned nematic transition in the BaFe2As2 family". United States. doi:10.1103/PhysRevB.100.064512.
@article{osti_1557784,
title = {Role of Fermi surface for the pressure-tuned nematic transition in the BaFe2As2 family},
author = {Gati, Elena and Xiang, Li and Bud'ko, Sergey L. and Canfield, Paul C.},
abstractNote = {We present that 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. Additionally, 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.},
doi = {10.1103/PhysRevB.100.064512},
journal = {Physical Review B},
number = 6,
volume = 100,
place = {United States},
year = {2019},
month = {8}
}

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