Article
Nematic fluctuations and phase transitions in LaFeAsO: A Raman scattering study
Physical Review B
Document Type
Article
Disciplines
Publication Version
Published Version
Publication Date
7-1-2017
DOI
10.1103/PhysRevB.96.014506
Abstract
Raman scattering experiments on LaFeAsO with distinct antiferromagnetic (TAFM=140 K) and tetragonal-orthorhombic (TS=155 K) transitions show a quasielastic peak (QEP) in B2g symmetry (2 Fe tetragonal cell) that fades away below ∼TAFM 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. The large separation between TS and TAFM in LaFeAsO compared to BaFe2As2 manifests itself in slower dynamics of nematic fluctuations in the former.
Copyright Owner
American Physical Society
Copyright Date
2017
Language
en
File Format
application/pdf
Citation Information
U. F. Kaneko, P. F. Gomes, A. F. García-Flores, J.-Q. Yan, et al.. "Nematic fluctuations and phase transitions in LaFeAsO: A Raman scattering study" Physical Review B Vol. 96 Iss. 1 (2017) p. 014506 Available at: http://works.bepress.com/thomas_lograsso/246/
This article is published as Kaneko, U. F., P. F. Gomes, A. F. García-Flores, J-Q. Yan, T. A. Lograsso, G. E. Barberis, D. Vaknin, and E. Granado. "Nematic fluctuations and phase transitions in LaFeAsO: A Raman scattering study." Physical Review B 96, no. 1 (2017): 014506. DOI: 10.1103/PhysRevB.96.014506. Posted with permission.