Nematic fluctuations and phase transitions in LaFeAsO: A Raman scattering study

Kaneko, U. F.; Gomes, P. F.; Garcia-Flores, A. F.; Yan, J. -Q.; Lograsso, T. A.; Barberis, G. E.; Vaknin, D.; Granado, E.

doi:10.1103/PhysRevB.96.014506

Title: Nematic fluctuations and phase transitions in LaFeAsO: A Raman scattering study

Journal Article · Mon Jul 10 00:00:00 EDT 2017 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.96.014506· OSTI ID:1374745

Kaneko, U. F. ^[1]; Gomes, P. F. ^[2]; Garcia-Flores, A. F. ^[3]; Yan, J. -Q. ^[4]; Lograsso, T. A. ^[5]; Barberis, G. E. ^[1]; Vaknin, D. ^[5]; Granado, E. ^[1]

Univ. of Campinas-UNICAMP, Sao Paulo (Brazil)
Univ. of Campinas-UNICAMP, Sao Paulo (Brazil); Federal Univ. of Goias-UFG, Goias (Brazil)
Federal Univ. of ABC-UFABC, Sao Paulo (Brazil)
Ames Lab., Ames, IA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)

Raman scattering experiments on LaFeAsO with distinct antiferromagnetic (T_AFM=140 K) and tetragonal-orthorhombic (T_S=155 K) transitions show a quasielastic peak (QEP) in B_2g symmetry (2 Fe tetragonal cell) that fades away below ~T_AFM and is ascribed to electronic nematic fluctuations. A scaling of the reported shear modulus with the T dependence of the QEP height rather than the QEP area indicates that magnetic degrees of freedom drive the structural transition. As a result, the large separation between T_S and T_AFM in LaFeAsO compared to BaFe₂As₂ manifests itself in slower dynamics of nematic fluctuations in the former.

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Research Organization:: Ames Lab., Ames, IA (United States)

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

Grant/Contract Number:: 2012/04870-7; AC02-07CH11358

OSTI ID:: 1374745

Alternate ID(s):: OSTI ID: 1369090

Report Number(s):: IS-J-9405; PRBMDO; TRN: US1702793

Journal Information:: Physical Review B, Vol. 96, Issue 1; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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