Neutron spectroscopic studies of the crystal field in : evidence for a percolative metal-insulator transition
- 24 August 1998
- journal article
- Published by IOP Publishing in Journal of Physics: Condensed Matter
- Vol. 10 (33) , 7369-7382
- https://doi.org/10.1088/0953-8984/10/33/008
Abstract
Crystal-field (CF) transitions within the ground-state J-multiplet of in have been observed with inelastic neutron scattering. From the CF parameters a negative charge enhancement in the planes is derived upon doping with cerium. Two electronically inequivalent sites in the Ce-doped samples are identified corresponding to undoped and doped micro-regions. Furthermore, the volume fraction of the two components is determined, and it is shown that the metal-insulator transition can be explained by the formation of a two-dimensional percolative network of the doped micro-regions.Keywords
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