Michèle D. Faucher

Spectroscopy of Eu3+ ions in monazite type lanthanide orthophosphates LnPO4, Ln = La or Eu

The luminescence of Eu3+ in two monazite-type orthophosphates: La0.98Eu0.02PO4 and EuPO4 is investigated by site-selective time-resolved spectroscopy. Informations on the nature of perturbed sites in the doped phosphate and on the localization of the europiums on normal lanthanum sites or on perturbed sites are discussed considering the crystal field parameters and the analysis of the site-to-site energy transfers. Vibronic satellites are observed in both the doped and the neat compounds and assigned to the coupling between the 5D0 → 7F0,1,2 transitions and the localized vibration modes of the (PO4)3− groups.

Thermodynamic and single-ion properties of Tb 3¿ within the collective paramagnetic-spin liquid state of the frustrated pyrochlore antiferromagnet Tb2Ti2O7

In a recent letter [Phys. Rev. Lett. {\bf 82}, 1012 (1999)] it was found that the Tb

Configuration interaction of Pr3+ in PrCl63−

^{3+}

4f5d–4f2 emission transitions of Pr3+

magnetic moments in the Tb

Chapter 144 Crystal field in non-metallic (rare earth) compounds

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Configuration interaction of Er3+ with a charge transfer configuration in the elpasolite compound Cs2NaErCl6

Ti

Electronic structure of Pr3+ and Tm3+ doped LiYO2

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Spectroscopic study of crystalline Nd2O2S: Optical absorption measurements, crystal field analysis and intensity calculations

O

Comparison between correlation crystal field calculations using extended basis sets and two-electron operators

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Optical spectrum, crystal field analysis of Pr3+ in YPO4

pyrochlore lattice of corner-sharing tetrahedra remain in a {\it collective paramagnetic} state down to 70mK. In this paper we present results from d.c. magnetic susceptibility, specific heat data, inelastic neutron scattering measurements, and crystal field calculations that strongly suggest that (1) the Tb