Unexpectedly Large Electron Correlation Measured in Auger Spectra of Ferromagnetic Iron Thin Films: Orbital-Selected Coulomb and Exchange Contributions

R. Gotter, A. Verna, M. Sbroscia, R. Moroni, F. Bisio, S. Iacobucci, F. Offi, S. R. Vaidya, A. Ruocco, and G. Stefani
Phys. Rev. Lett. 125, 067202 – Published 6 August 2020
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Abstract

A set of electron-correlation energies as large as 10 eV have been measured for a magnetic 2 ML Fe film deposited on Ag(001). By exploiting the spin selectivity in angle-resolved Auger-photoelectron coincidence spectroscopy and the Cini-Sawatzky theory, the core-valence-valence Auger spectrum of a spin-polarized system have been resolved: correlation energies have been determined for each individual combination of the two holes created in the four subbands involved in the decay: majority and minority spin, as well as eg and t2g. The energy difference between final states with parallel and antiparallel spin of the two emitted electrons is ascribed to the spin-flip energy for the final ion state, thus disentangling the contributions of Coulomb and exchange interactions.

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  • Received 14 May 2020
  • Accepted 8 July 2020

DOI:https://doi.org/10.1103/PhysRevLett.125.067202

© 2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

R. Gotter1,*, A. Verna2, M. Sbroscia2,†, R. Moroni3, F. Bisio3, S. Iacobucci2,4, F. Offi2, S. R. Vaidya1,5,‡, A. Ruocco2, and G. Stefani2,4

  • 1CNR-IOM, Istituto Officina dei Materiali, c/o Area Science Park, SS14 km 163,5 I-34149 Basovizza-Trieste, Italy
  • 2Dipartimento di Scienze, Università degli Studi Roma Tre, Via della Vasca Navale 84, I-00146 Rome, Italy
  • 3CNR-SPIN, Corso Perrone 24, I-16152 Genova, Italy
  • 4CNR-ISM, Via Fosso del Cavaliere 100, 00133 Roma, Italy
  • 5Scuola di Dottorato in Nanotecnologie, Università di Trieste, Piazzale Europa 1, I-34127 Trieste, Italy

  • *gotter@iom.cnr.it
  • Present address: Dipartimento di Fisica, Sapienza Universitá di Roma, Piazzale Aldo Moro 2, I-00185 Rome, Italy
  • Present address: Department of Physics, Southern Connecticut State University, 501 Crescent St, New Haven, Connecticut 06515, USA

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Issue

Vol. 125, Iss. 6 — 7 August 2020

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