Absence of spin-orbit-coupling-induced effects on lattice dynamics in CePt3Si

Abstract

Motivated by model calculations for the heavy fermion superconductor CePt3Si predicting phonon anomalies because of anti-symmetric spin-orbit coupling we performed a detailed experimental study of the lattice dynamical properties of CePt3Si. In particular, we investigated the dispersion of transverse acoustic and low energy optic phonon branches along the [110] direction using inelastic neutron scattering. In these branches, we found deviations from our ab-initio lattice dynamical calculations, which overall give a good description of the phonon dispersion in CePt3Si. However, the agreement for the [110] transverse modes can be improved if we neglect the Ce 4f states, done in an additional calculation. We conclude that the lattice dynamics of CePt3Si are conventional and that the observed deviations are not related to effects of anti-symmetric spin-orbit-coupling. More likely, ab-initio calculations overestimate the exchange between different phonon branches, particularly in the presence of 4f electron states. Our results imply that the ASOC plays less a role in non-centrosymmetric superconductors than commonly believed.

arXiv commentaccepted by PRB

References in corpus (24)

• Phonons and related properties of extended systems from density-functional perturbation theory
• Heavy fermion superconductivity and magnetic order in non-centrosymmetric $CeP{t}_{3}Si$
• Non-Abelian Topological Order in S-Wave Superfluids of Ultracold Fermionic Atoms
• Superconductivty without inversion symmetry: MnSi versus CePt_3Si
• CePt3Si: an unconventional superconductor without inversion center
• Topological spin-current in non-centrosymmetric superconductors
• Spin susceptibility in superconductors without inversion symmetry
• Anomalous Andreev bound state in non-centrosymmetric superconductors
• Surface bound states and spin currents in non-centrosymmetric superconductors
• Gap structure in noncentrosymmetric superconductors
• Non-centrosymmetric Superconductivity and Antiferromagnetic Order: Microscopic discussion of CePt${}_3$Si
• Optic phonons and the soft mode in 2H-NbSe2
• On the spin susceptibility of noncentrosymmetric superconductors
• Enhanced triplet superconductivity in noncentrosymmetric systems
• Microscopic Mechanism and Pairing Symmetry of Superconductivity in the Noncentrosymmetric Heavy Fermion Systems CeRhSI${}_3$ and CeIrSi${}_3$
• Impurity resonance states in noncentrosymmetric superconductor $CeP{t}_{3}Si$: a probe for Cooper-pairing symmetry
• Spin fluctuations and superconductivity in noncentrosymmetric heavy fermion systems CeRhSi${}_3$ and CeIrSi${}_3$
• Phonons and electron-phonon coupling in the phonon-mediated superconductor YNi2B2C
• Vortex avalanches in the non-centrosymmetric superconductor Li2Pt3B
• Unusual behaviours and Impurity Effects in the Noncentrosymmetric Superconductor CePt3Si
• Unambiguous probe of parity-mixing of Cooper pairs in noncentrosymmetric superconductors
• Josephson Effect and Triplet--Singlet Ratio of Non--centrosymmetric Superconductors
• Electronic Raman scattering in non-centrosymmetric superconductors
• Extreme vortex pinning in the non-centrosymmetric superconductor CePt${}_3$Si

Cited by in corpus (1)

• Localization and Topology in Noncentrosymmetric Superconductors with Disorder