Ingredients for the electronic nematic phase in FeSe revealed by its anisotropic optical response

Chinotti, M.; Pal, A.; Degiorgi, L.; Böhmer, A. E.; Canfield, P. C.

doi:10.1103/PhysRevB.98.094506

Ingredients for the electronic nematic phase in FeSe revealed by its anisotropic optical response

Journal Article · Thu Sep 06 00:00:00 EDT 2018 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.98.094506· OSTI ID:1466330

Chinotti, M. ^[1]; Pal, A. ^[1]; Degiorgi, L. ^[1]; Böhmer, A. E. ^[2]; Canfield, P. C. ^[3]

ETH - Zurich, Zurich (Switzerland)
Ames Lab., Ames, IA (United States); Karlsruhe Institute for Technology, Karlsruhe (Germany)
Ames Lab., Ames, IA (United States)

The origin of the anisotropy in physical quantities related to a symmetry-broken (nematic) electronic state is still very much debated in high-temperature superconductors. FeSe at ambient pressure undergoes a structural, tetragonal-to-orthorhombic phase transition at T_s ≃ 90 K without any magnetic ordering on further cooling, which leads to an ideal electronic nematicity. Our unprecedented optical results provide evidence that the low-energy excitation spectrum in the nematic phase is shaped by an important interplay of the anisotropic Drude weight and scattering rate. In the zero-frequency limit though, the temperature dependence of the anisotropic scattering rate plays the dominant role and, combined with the nematic order parameter as evinced from the high energy optical response, accounts for the anisotropic dc resistivity. In conclusion, this favors the scattering by anisotropic spin fluctuations as the prominent candidate in governing the properties of the nematic phase.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1466330

Alternate ID(s):: OSTI ID: 1468871

Report Number(s):: IS-J--9734

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 9 Vol. 98; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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