Crystal field levels of Pr³⁺ in PrFeO₃ and PrGaO₃ determined by inelastic neutron scattering

Abstract

The crystal field splitting of the ground state of the Pr ion in PrFeOa and PrGaO, has been investigated by inelastic scattering of thermal neutrons. At several temperatures the transitions have been measured by TAS and TOF methods for polycrystalline PrFeO, and by the TOF method for polycrystalline PrGaO,. Energy level schemes which are different for these materials are given.

Role of magnetic exchange energy on charge ordering inR1/3Sr2/3FeOMa1, Yan2, Diallo3 et al. 2011Phys. Rev. B211100View full textAdd to dashboardCite

“…[20,21] There are discrepancies between our measurements of CEF excitations in PFO and the calculations for PGO. First, the CEF transition predicted to appear around ∼ 67 meV was not observed in our measurement.…”

“…The proposed observation of this CEF transition was mentioned in regards to INS measurements of PFO and PGO. [20,21]. However, this analysis did not report the spin-wave excitation of Fe 3+ ions, [21] and the magnetic peak claimed to be a CEF around ∼ 60 meV is much more likely to be Fe compared to PGO.…”

“…We next examine the CEF transitions in PFO. Although many experimental and theoretical studies on Pr 3+ in perovskite oxides have been performed, [20,21] we know of no complete set of experimental data for CEF levels of Pr 3+ ions in the perovskite structure ABO 3 . There are 2 unpaired f -electrons for Pr 3+ and the electronic term is 3 H 4 .…”

“…Similar to the analysis of NFO, the magnetic form factor of Pr 3+ in PFO is taken from the literature [17] and used with the previously observed transitions from Ref. [20] in Table V to establish the fraction of different contributions to the total cross-section. Fig.…”

Performance test on PELICAN – a multi-purpose time of flight cold neutron spectrometer

“…The spectrum is the integration over 180 detectors covering angular range from 12 degree to 125 degree, after vanadium normalization and empty can subtraction. The measurement agrees very well with previous observation [8] and recent measurement on Hyspec instrument at SNS, USA [9]. This has provided a benchmark test of the Pelican instrument and the associated LAMP data reduction software [7].…”