Anomalies in the core level spectroscopy of a noncentrosymmetric solid, BiPd
arXiv:1909.10009 · doi:10.1103/PhysRevB.101.035426
Abstract
Understanding exotic solids is a difficult task as interactions are often hidden by the symmetry of the system. Here, we study the electronic properties of a noncentrosymmetric solid, BiPd, which is a rare material exhibiting both superconductivity and topological phase of matter. Employing high resolution photoemission spectroscopy with photon energies ranging from hard x-ray to extreme ultraviolet regime, we show that hard x-ray spectroscopy alone is not enough to reveal surface-bulk differences in the electronic structure. We derived the escape depths close to the extreme surface sensitivity and find that the photon energies used for high resolution measurements such as ARPES fall in the surface sensitive regime. In addition, we discover deviation of the branching ratio of Bi core level features derived from conventional quantum theories of the core hole final states. Such paradigm shift in core level spectroscopy can be attributed to the absence of center of symmetry and spin-orbit interactions.
References in corpus (15)
- Dirac Surface States and Nature of Superconductivity in Noncentrosymmetric BiPd
- Evolution of spectral function in a doped Mott insulator : surface vs. bulk contributions
- Understanding the bulk electronic structure of Ca1-xSrxVO3
- Observation of Andreev bound state and multiple energy gaps in the non-centrosymmetric superconductor BiPd
- Origin of charge density wave formation in insulators from a high resolution photoemission study of BaIrO3
- Observation of the spin-polarized surface state in a noncentrosymmetric superconductor BiPd
- A high resolution, hard X-ray photoemission investigation of BaFeAs: moderate influence of the surface and evidence for a low degree of Fe 3d - As 4p hybridization of the near-E electronic states
- Anisotropic superconductivity in the noncentrosymmetric BiPd
- An insight into spin-chain magnetism through Moessbauer spectroscopic investigations in Eu-doped Ca3Co2O6 and Ca3CoRhO6
- Observation of Dirac surface states in the noncentrosymmetric superconductor BiPd
- Unusual Dirac fermions on the surface of noncentrosymmetric - BiPd superconductor
- Experimental verification of the surface termination in the topological insulator TlBiSe using core-level photoelectron spectroscopy and scanning tunneling microscopy
- Electronic and structural transition in
- Manifestation of lattice distortions in the O 1s spectra in Ca1-xSrxRuO3
- Surface bulk differences in a conventional superconductor, ZrB(12)