Münster 1999 – scientific programme

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AM: Magnetismus

AM 9: Spektroskopie II

AM 9.6: Talk

Tuesday, March 23, 1999, 15:45–16:00, F4

Energy of 4f-levels in IPE and MO transitions from La-chalcogenides — •F. Huebinger, G. Kaindl, and K. Starke — Inst. f. Experimentalphysik, FU Berlin, Arnimallee 14, D-14195 Berlin-Dahlem

Recent studies of La-chalcogenides gave evidence of magnetooptical (MO) transitions with large Kerr rotations even in paramagnetic materials [1,2]. The MO signals were attributed to an involvement of 4f states being spin-polarized in external fields. However, for a reliable interpretation an exact knowledge of the unoccupied 4f-level energies in the La-chalcogenides is needed. Using a high-resolution inverse photoemission (IPE) spectrometer we have investigated the unoccupied energy-level sheme of LaX single crystals (with X = S, Se). The 4f-level energies do not coincide with the sharp low-energy features [1], but are close to broader structures found in an extended MO study [2]. - We give a detailed comparison of 5d-4f MO transition energies and 4fⁿ⁺¹-electron addition states probed by IPE.
R. Pittini et al., Phys. Rev. Lett 78, 725 (1997).
F. Salghetti-Drioli et al., (preprint).