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

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

doi:10.1103/PhysRevB.100.064512

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

Journal Article · Thu Aug 15 00:00:00 EDT 2019 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.100.064512· OSTI ID:1557784

Gati, Elena ^[1]; Xiang, Li ^[1]; Bud'ko, Sergey L. ^[1]; Canfield, Paul C. ^[1]

Ames Lab. and Iowa State Univ., Ames, IA (United States)

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 BaFe₂As₂, 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.

View Accepted Manuscript (DOE)

Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1557784

Alternate ID(s):: OSTI ID: 1557387

Report Number(s):: IS-J--9998

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 6 Vol. 100; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited By (2)

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Measurements of elastoresistance under pressure by combining in-situ tunable quasi-uniaxial stress with hydrostatic pressure Gati, Elena; Xiang, Li; Bud'ko, Sergey L. arXiv https://doi.org/10.48550/arxiv.1911.08599	text	January 2019

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