Nematic Fluctuations and Phase Transitions in LaFeAsO: a Raman Scattering Study

Autor:	Kaneko, U. F., Gomes, P. F., Garcia-Flores, A. F., Yan, J. Q., Lograsso, T. A., Barberis, G. E., Vaknin, D., Granado, E.
Rok vydání:	2017
Předmět:	Condensed Matter - Strongly Correlated Electrons Condensed Matter - Materials Science Condensed Matter - Superconductivity
Zdroj:	Phys. Rev. B 96, 014506 (2017)
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevB.96.014506
Popis:	Raman scattering experiments on LaFeAsO with splitted antiferromagnetic (T_AFM = 140 K) and tetragonal-orthorhombic (T_S = 155 K) transitions show a quasi-elastic peak (QEP) in B2g 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. The large separation between T_S and T_AFM in LaFeAsO compared with their coincidence in BaFe2As2 manifests itself in slower dynamics of nematic fluctuations in the former. Comment: 8 pages, 9 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1702.03774 Zobrazit plný text záznamu View this record from Arxiv