Coupling of fully symmetric As phonon to magnetism in Ba(Fe1-xAux)2As2

Wu, S. -F.; Zhang, W. -L.; Li, L.; Cao, H. -B.; Kung, H. -H.; Sefat, A. S.; Ding, H.; Richard, P.; Blumberg, G.

doi:10.1103/physrevb.102.014501

Title: Coupling of fully symmetric As phonon to magnetism in Ba(Fe_1-xAu_x)₂As₂

Journal Article · Mon Jul 06 00:00:00 EDT 2020 · Physical Review B

DOI:https://doi.org/10.1103/physrevb.102.014501· OSTI ID:1651257

Wu, S. -F. ^[1]; Zhang, W. -L. ^[2];

^[3];

^[3]; Kung, H. -H. ^[1];

^[3]; Ding, H. ^[4]; Richard, P. ^[5];

^[6]

Rutgers Univ., Piscataway, NJ (United States)
Rutgers Univ., Piscataway, NJ (United States); Sophia Univ., Tokyo (Japan)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Chinese Academy of Sciences (CAS), Beijing (China). Beijing National Lab. for Condensed Matter Physics; Univ. of Chinese Academy of Sciences, Beijing (China)
Univ. de Sherbrooke, QC (Canada)
Rutgers Univ., Piscataway, NJ (United States); National Inst. of Chemical Physics and Biophysics, Tallinn (Estonia)

In this work, we study the coupling of the fully symmetric vibration mode of arsenic atoms to magnetism in a $Ba {({Fe}_{1 - x} {Au}_{x})}_{2} {As}_{2}$ system by polarization-resolved Raman spectroscopy and neutron diffraction. In this system, there are two phase transitions: a tetragonal-to-orthorhombic structural phase transition at temperature $T_{S}$ and a magnetic phase transition into collinear spin-density wave (SDW) state at temperature $T_{N}$ ( $\leq T_{S}$ ). $T_{S}$ and $T_{N}$ almost coincide in the pristine compound, whereas they differ by as much as 8 K for compounds with dilute gold substitution for iron. Raman coupling to the $A_{g}$ (As) phonon is forbidden for the $X Y$ scattering geometry in the tetragonal phase above $T_{S}$ , whereas it becomes allowed in the orthorhombic phase below $T_{S}$ : The emerging mode's intensity indicates the lattice orthorhombicity. Furthermore, we find that upon cooling below $T_{S}$ , first, weak $A_{g}$ (As) phonon mode intensity appears in the $X Y$ scattering geometry spectra; however, the mode's intensity is significantly enhanced in the magnetic phase below $T_{N}$ . The $A_{g}$ (As) phonon also shows an asymmetric line shape below $T_{N}$ and an anomalous linewidth broadening upon Au doping. We describe the anomalous behavior of the $A_{g}$ (As) mode in the $X Y$ scattering geometry using a Fano model involving the $A_{g}$ (As) phonon interacting with the $B_{2 g} (D_{4 h}$ )-symmetry-like electron-hole continuum. We conclude that the temperature dependence of light coupling amplitude to the $A_{g}$ (As) phonon follows the evolution of the magnetic order parameter $M (T)$ . We propose that the intensity enhancement of the $A_{g}$ (As) phonon in the $X Y$ scattering geometry below $T_{N}$ is due to electronic anisotropy induced by the collinear SDW order parameter.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); Gordon and Betty Moore Foundation; Estonian Research Council; European Research Council (ERC)

Grant/Contract Number:: AC05-00OR22725; GBMF5305; 885413; PRG736; DMR-1709161

OSTI ID:: 1651257

Journal Information:: Physical Review B, Vol. 102, 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: 3 works

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Title: Coupling of fully symmetric As phonon to magnetism in Ba(Fe_1-xAu_x)₂As₂