Volume 108, Number 3, November 2014
|Number of page(s)||6|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||03 November 2014|
Pressure-induced spin transition and evolution of the electronic excitations of FeBO3: Resonant inelastic x-ray scattering results
1 Advanced Photon Source, Argonne National Laboratory - Argonne, IL 60439, USA
2 Geophysical Laboratory, Carnegie Institution of Washington - 5251 Broad Branch Road NW, Washington DC 20015, USA
3 L.V. Kirensky Institute of Physics, Siberian Branch of Russian Academy of Sciences - Krasnoyarsk 660036, Russia
4 Siberian Federal University - 79 Svobodny Prospect, Krasnoyarsk 660041, Russia
5 Institute for Nuclear Research, Russian Academy of Sciences - Troitsk, Moscow 142190, Russia
6 Institute of Crystallography, Russian Academy of Sciences - 119333, Leninskii pr-t 59, Moscow, Russia
7 HPCAT, Carnegie Institution of Washington - 9700 South Cass Avenue, Argonne, IL 60439, USA
Received: 16 October 2014
Accepted: 18 October 2014
A high-pressure resonant inelastic x-ray scattering (RIXS) of at the Fe K pre-edge has been carried out to study the evolution of electronic excitations through the pressure-induced spin transition. Systematic peak shifts with insignificant peak width change are observed with increasing pressure in the high-spin state. An electronic transition occurs in tandem with the high-spin to low-spin transition, observed as the emergence of multiple new low-energy peaks in the spectra. The energy gap is reduced due to these low-energy peaks, not a peak width broadening. The observed electronic excitations are associated with dd excitations, which are calculated using a full-multiplet theory. We consider changes in crystal-field splitting and covalency to explain the observed peak shifts in the high-spin state. The new peaks that emerge upon the high-to low-spin transition are compared with dd excitations for the low-spin configuration.
PACS: 71.27.+a – Strongly correlated electron systems; heavy fermions / 62.50.-p – High-pressure effects in solids and liquids / 78.70.Ck – X-ray scattering
© EPLA, 2014
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