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Energy scale of nematic ordering in the parent iron-based superconductor BaFe2As2

DOI: 10.1103/PhysRevB.100.024517 DOI Help

Authors: Alexander Fedorov (Leibniz Institute for Solid State and Materials Research IFW Dresden; Helmholtz-Zentrum Berlin für Materialien und Energie) , Alexander Yaresko (Max Planck Institute for Solid State Research) , Erik Haubold (Leibniz Institute for Solid State and Materials Research IFW Dresden) , Yevhen Kushnirenko (Leibniz Institute for Solid State and Materials Research IFW Dresden) , Timur Kim (Diamond Light Source) , Bernd Büchner (Leibniz Institute for Solid State and Materials Research IFW Dresden) , Saicharan Aswartham (Leibniz Institute for Solid State and Materials Research IFW Dresden) , Sabine Wurmehl (Leibniz Institute for Solid State and Materials Research IFW Dresden) , Sergey Borisenko (Leibniz Institute for Solid State and Materials Research IFW Dresden)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 100

State: Published (Approved)
Published: July 2019
Diamond Proposal Number(s): 13856 , 15936

Abstract: Nematicity plays an important role in the physics of iron-based superconductors (IBS). Its microscopic origin and in particular its importance for the mechanism of high-temperature superconductivity itself are highly debated. A crucial knowledge in this regard is the degree to which the nematic order influences the electronic structure of these materials. Earlier angle-resolved photoemission spectroscopy (ARPES) studies found that the effect is dramatic in three families of IBS including 11, 111, and 122 compounds: Energy splitting reaches 70 meV and Fermi surface becomes noticeably distorted. More recent experiments, however, reported significantly lower energy scale in 11 and 111 families, thus questioning the degree and universality of the impact of nematicity on the electronic structure of IBS. Here, we revisit the electronic structure of the undoped parent BaFe 2 As 2 (122 family). Our systematic ARPES study, including the detailed temperature and photon energy dependencies, points to the significantly smaller energy scale also in this family of materials, thus establishing the universal scale of this phenomenon in IBS. Our results form a necessary quantitative basis for theories of high-temperature superconductivity focused on the nematicity.

Subject Areas: Physics, Materials


Instruments: I05-ARPES