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Type: Artigo
Title: Nematic fluctuations and phase transitions in LaFeAsO: a Raman scattering study
Author: Kaneko, U. F.
Gomes, P. F.
García-Flores, A. F.
Yan, J.-Q.
Lograsso, T. A.
Barberis, G. E.
Vaknin, D.
Granado, E.
Abstract: 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 similar to 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 to BaFe2As2 manifests itself in slower dynamics of nematic fluctuations in the former.
Subject: Supercondutores - Materiais
Supercondutores à base de ferro
Superconductors - Materials
Iron-based superconductors
Country: Estados Unidos
Editor: American Physical Society
Rights: aberto
Identifier DOI: 10.1103/PhysRevB.96.014506
Date Issue: 2017
Appears in Collections:IFGW - Artigos e Outros Documentos

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