Lattice dynamics and coupled quadrupole-phonon excitations in CeAuAl${}_3$

Abstract

We report first principles calculations of the structural parameters and phonon dispersion of the tetragonal non-centrosymmetric heavy fermion compound CeAuAl${}_3$. Taking into account weak magnetoelastic interactions of the rare-earth (RE) ions with the spectrum of phonons, we obtain an analytical expression for the hybridization of quadrupole excitations and phonons from the poles of the one-phonon Green-function. In the paramagnetic phase, we predict the formation of mixed modes that may be observed by inelastic neutron scattering. Our results show that magnetoelastic interactions, albeit being moderate, play an important role in CeAuAl${}_3$. This suggests that magnetoelastic interactions may be equally important in a wide range of related compounds.

arXiv comment7 pages, 5 figures

References in corpus (4)

• Effective Spin Models for Spin-Phonon Chains by Flow Equations
• Neutron scattering and muon spin relaxation measurements of the non-centrosymmetric antiferromagnet CeCoGe3
• Muon spin rotation and neutron scattering study of the non-centrosymmetric tetragonal compound CeAuAl3
• Single crystal growth of CeTAl${}_3$ (T = Cu, Ag, Au, Pd and Pt)

Cited by in corpus (5)

• Magnetoelastic hybrid excitations in CeAuAl${}_3$
• Systematic extraction of crystal electric-field effects and quantum magnetic model parameters in triangular rare-earth magnets
• Nearly-Resonant Crystalline-Phononic Coupling in Quantum Spin Liquid Candidate CsYbSe${}_2$
• Local atomic arrangement in LaCuAl3 and LaAuAl3 by NMR and density functional theory
• Phononic enhancement and detection of hidden spin-nematicity and dynamics in quantum magnets