论文信息 - The hyperfine interactions of fluorine ions in the vicinity of Cr3+ and Cr+ in KMgF3. I. 19F and 53Cr ENDOR measurements

The hyperfine interactions of fluorine ions in the vicinity of Cr3+ and Cr+ in KMgF3. I. 19F and 53Cr ENDOR measurements

ENDOR measurements on the nuclei of the first, second and third nearest sets of fluorine ions to Cr3+ and Cr+ in KMgF3 are reported. The main results concern the second nearest, whose hyperfine tensors are found in both cases to show significant departures from the values expected on a purely dipolar basis. The axial third nearest fluorines for Cr+ also show small departures from the predicted dipolar interaction, but those for Cr3+ do not. For Cr3+ a term in the spin Hamiltonian cubic in the electronic spin and linear in the first nearest fluorine nuclear spin was detected. 53Cr ENDOR was observed for Cr3+, and the hyperfine constant determined to be (17.887+or-0.005)*10-4 cm-1.

J. Davies | K. Horai

[1] J. Davies. Transferred hyperfine interactions through unpaired spin on intervening ions: V2+ and Mn2+ in KMgF3 , 1968 .

[2] G. A. Woonton,et al. ON THE HYPERFINE STRUCTURE OF TRIVALENT CHROMIUM IN A CUBIC ENVIRONMENT , 1967 .

[3] J. Thornley,et al. Covalent bonding and magnetic properties of transition metal ions , 1966 .

[4] W. W. Piper,et al. Complex Hyperfine Structure in the EPR Spectrum of(FeF6)3−in CdTe , 1966 .

[5] T. Ray. Generalized spin-Hamiltonian for paramagnetic ions in crystals. I. General formalism and its application to cubic crystalline symmetry , 1964, Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences.

[6] R. Shulman,et al. Interactions of p σ and p π Orbitals in Transition Element Fluorides , 1960 .

[7] J. Owen,et al. Paramagnetic Resonance II , 1955 .