Investigation of Jahn–Teller splitting with O 1s x-ray absorption spectroscopy in strained Nd1−xCaxMnO3 thin films

Abstract

Electronic structures of strained Nd 1−x Ca x MnO 3 ͑NCMO͒ thin films with x = 0 to 0.8 are investigated via x-ray absorption spectroscopy ͑XAS͒. The obtained O 1s spectra within the photon energy 529-535 eV can be decomposed into e g ↑ 1 , e g ↑ 2 , t 2g ↓, and e g ↓ bands. Based on the assigned energy levels of these band states, the energies of magnetic exchange, crystal field and Jahn-Teller ͑JT͒ splitting are determined. Particularly, the JT splitting is around 0.8 eV, which is observed with O 1s XAS for the first time in NCMO thin films.

Tuning the Electronic Spin State of Catalysts by Strain Control for Highly Efficient Water Electrolysis

“…The oxygen K‐edge XANES spectra (Figure c) display a peak at 531 eV, which is assigned to the transition from O 1s to O 2p/Co 3d . De Groot et al, reported that the peak at 531 eV is related to the metal 3d states, which might be split into two peaks assignable to t 2g and e g .…”

Atomic replacement effects on the band structure of doped perovskite thin films

“…Although many papers report the magnetic and electronic properties of R 1-x A x MnO 3 18–20 , they mostly report on bulks and much less often on films 21–24 . For future applications of manganite films, a detailed characterization of the film properties is required.…”

The role of the hybridization between Mn 3d and O 2p orbitals in the existence of the Griffiths phase in La0.85Ca0.15MnO3

“…The pre-edge feature in the O K-edge spectra (around 529.4 eV) is due to the strong hybridization between Mn 3d and O 2p orbitals [43]. This energy position near 530 eV is mainly contributed from the t 2g states [43]. Therefore, the increase of this peak intensity suggests an increasing number of unoccupied Mn 3d t 2g ↓ states coupled with O 2p states.…”

“…It can be seen that the intensity of peak A increases with decreasing temperature. The pre-edge feature in the O K-edge spectra (around 529.4 eV) is due to the strong hybridization between Mn 3d and O 2p orbitals [43]. This energy position near 530 eV is mainly contributed from the t 2g states [43].…”

“…The O K-edge XAS spectra corresponding to a transition from 1s to 2p states consist of three absorption peaks, which are labelled A, B, and C in figure 3(b). The first peak A corresponds to the hybridization of O 2p states with Mn 3d states [43]. The second peak B and the third peak C are attributed to the contribution from O 2p states hybridized with La 5d/Ca 3p and Mn 4s/Ca 4p states, respectively [44].…”