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

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

doi:10.1103/PhysRevB.96.014506

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

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

Correlated Electron Materials

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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.

Original language	English
Article number	014506
Journal	Physical Review B
Volume	96
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevB.96.014506
State	Published - Jul 10 2017

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© 2017 American Physical Society.

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title = "Nematic fluctuations and phase transitions in LaFeAsO: A Raman scattering study",

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.",

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T2 - A Raman scattering study

AU - Kaneko, U. F.

AU - Gomes, P. F.

AU - García-Flores, A. F.

AU - Yan, J. Q.

AU - Lograsso, T. A.

AU - Barberis, G. E.

AU - Vaknin, D.

AU - Granado, E.

PY - 2017/7/10

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AB - 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.

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

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