B R Judd 1980 J. Phys. C: Solid State Phys. 13 2695 doi:10.1088/0022-3719/13/14/011
B R Judd
Show affiliationsThe tendency of Eu3+ in a crystal to attract an electron from the surrounding ligands and become Eu2+ can be represented by a six-body operator acting within the configuration 4f6. The matrix elements of this operator within any configuration 4fN with N>6 are expressible in terms of those of the unit tensors U(k) and the double tensor V(1k). This mechanism of charge transfer generally acts in a sense opposite to that of the spin correlated crystal field. This provides a possible source for the anomalous crystal-field splittings of Ho3+ 4f10 3KJ as well as the abrupt decline in the sixth-rank crystal-field parameters in passing from Eu3+ to Tb3+ in the LaCl3 lattice.
Issue 14 (20 May 1980)
B R Judd 1980 J. Phys. C: Solid State Phys. 13 2695
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