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Delamoye, P.; Rajnak, K.; Genet, M.; Edelstein, Norman M.

doi:10.1103/physrevb.28.4923

Cited by 45 publications

(16 citation statements)

References 22 publications

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“…Anticipating the fact ( § 4) that all sharp absorption structures with two (n) or two/three «(1) singularities actually cover only one electronic origin in D2d, we have summarized our results for energy, polarization and dipole strengths in the first three columns of table II. The figures quoted are sometimes slightly different from those published previously [7], due to the use of several spectrometers. Fig.…”

Section: Low Lying Doubletcontrasting

confidence: 63%

“…(2) Note that our present definition of g is different from that (g') used in reference [7]. We have the relation g' _ -2 g.…”

Section: Low Lying Doubletmentioning

confidence: 93%

“…Basically, in the INC phase there is a transverse sinusoidal displacement of the bromide ions perpendicular to the c-axis of the crystal and the crystal field probed by U4+ is either D2d or D2. This model has recently been checked further against site-selective excitation measurements [6] and theoretical calculations [7]. All experimental data available support a continuous distribution of crystal-field strengths at the U4+ sites.…”

Section: Introductionmentioning

confidence: 95%

“…Without loss of generality, we can always state that vi > 0 and so only change the sign of v2 to simulate all possible situations. Only slight modifications in equations (6), (7) are necessary in order to compute profiles for the hot bands associated with doubletsinglet transitions (D2d nomenclature).…”

Section: Low Lying Doubletmentioning

confidence: 99%

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Spectroscopic study of the incommensurate phase of ThBr4 via the optical and magnetooptical properties of U4+

et al. 1985

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U4+ is used to probe the incommensurate structure of ThBr 4 via absorption and magnetic circular dichroism (MCD) measurements. Below Tc = 95 K, the crystal field experienced by U 4+ ions is either of D2d or D2 symmetry. This can be simulated by varying a phase angle ϕ form 0(D 2d) to ± π/2 (D2). One very neat advantage of MCD over absorption is that the D2d centres show up very clearly in the former due to the occurrence of a derivative-like singularity. We present a model to simulate absorption, Zeeman and MCD profiles. It accounts satisfactorily for most of our data and we arrive at the following main conclusions : (i) it is probable that the phase is truly incommensurate since the lower limit of the number of sites is found to be 80; (ii) for a low concentration of U4+ (2 x 10-4), we found no evidence of a pinning of the incommensurate modulation by the impurities. MCD provides also a definite proof that the ground state of U 4+ in ThBr4 is Γ4 with a D2 d symmetry. Finally, we determine the Landé factors of five excited states, our findings being in fair agreement with the results of recent crystal field calculations

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Section: Low Lying Doubletcontrasting

confidence: 63%

“…(2) Note that our present definition of g is different from that (g') used in reference [7]. We have the relation g' _ -2 g.…”

Section: Low Lying Doubletmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 95%

Section: Low Lying Doubletmentioning

confidence: 99%

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Spectroscopic study of the incommensurate phase of ThBr4 via the optical and magnetooptical properties of U4+

et al. 1985

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“…Besides, optical properties of U 4? ions doped in ThCl 4 , ThBr 4 , ThSiO 4 , Ba 2 YCl 7 , and CsCdBr 3 single crystals have been also reported [12][13][14][15][16]. Upconversion of light excitation was observed in U 4?…”

Section: Introductionmentioning

confidence: 77%

Optical properties of U4+-doped KPb2Cl5 single crystal

Sobczyk

Drożdżyński

2009

Struct Chem

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A potassium lead(II) pentachloride (KPC) nonlinear single crystal doped with U 4? ions has been obtained by the Bridgman-Stockbarger method. Unpolarized absorption, excitation, and emission spectra of the crystal were recorded at room temperature in wide spectral ranges and are discussed. For the first time, the Judd-Ofelt intensity analysis of 5f 2 -5f 2 transitions in U 4? -doped single crystals has been performed. The experimental lifetimes for emitting levels in the visible spectral region are compared with those theoretically achieved by using the Judd-Ofelt approach.

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Observation of an incommensurate structure by optical spectroscopy with a 5f ion as an internal probe. U⁴⁺–ThCl₄ System

Krupa¹,

Malek²,

Delamoye³

et al. 1987

Physica Status Solidi (b)

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The second order phase transition in P-ThC14 (T, = 70 K) leads to an incommensurate tetragonal structure modulated along the fourfold symmetry axis. This is due to the freezing of an optical soft mode which induces a modulation of the chlorine ion positions in a plan perpendicular to this axis. Consequently in neighbouring unit cells the crystal field strength acting on the U4+ ion is slightly different. Then the line shape in the optical spectra shows a continuous variation which reflects the shift of the energy as the symmetry changes. Selective excitation of the resulting different classes of sites, S,, D,, and various C,p ermits one to establish a correlation between absorption and emission profiles of U4+ ions. The green and the red observed fluorescences of U4+ in ThCl, are assigned in the different symmetries and the energy level mapped out as a function of a phase angle ql related to the distortion according to the Delamoye and Currat model.Der Phasenubergang zweiter Ordnung in P-ThCl, (T, = 70 K) fuhrt zu einer inkommensurablen tetragonalen Struktur, die in Richtung der vierfachen Symmetrieachse moduliert ist. Dies riihrt vom Susfrieren einer optiscben Soft-Mode her, die eine Modulation der Chlorionenplatze in einer Ebene senkrecht zu dieser Achse induziert. Folglich ist in den benachbarten Einheitszellen die auf das U4+-Ion wirkende Kristallfeldstarke leicht unterschiedlich. Somit zeigt die Linienform in den optischen Spektren eine kontinuierliche Anderung, die die Verschiebung der Energie widerspiegelt, wenn sich die Symmetrie andert. Selektive Anregung der sich ergebenden unterschiedlichen Klassen der Platze S,, D, und verschiedene C,, erlaubt, eine Korrelation zwischen Absorptions-und Emissionsprofilen der U4f-Ionen aufzustellen. Die beobachtete grune und rote Fluoreszenz von U4+ in ThCl, in den verschiedenen Symmetrien werden zugeordnet und die Energieniveaus als Funktion eines Phasenwinkels ql dargestellt, der entsprechend dem Model1 von Delamoye und Currat mit der Verzerrung verkniipft ist.

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Parametric analysis of the energy levels ofU4+inD2d

Cited by 45 publications

References 22 publications

Spectroscopic study of the incommensurate phase of ThBr4 via the optical and magnetooptical properties of U4+

Spectroscopic study of the incommensurate phase of ThBr4 via the optical and magnetooptical properties of U4+

Optical properties of U4+-doped KPb2Cl5 single crystal

Observation of an incommensurate structure by optical spectroscopy with a 5f ion as an internal probe. U⁴⁺–ThCl₄ System

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Parametric analysis of the energy levels ofU4+inD2d

Cited by 45 publications

References 22 publications

Spectroscopic study of the incommensurate phase of ThBr4 via the optical and magnetooptical properties of U4+

Spectroscopic study of the incommensurate phase of ThBr4 via the optical and magnetooptical properties of U4+

Optical properties of U4+-doped KPb2Cl5 single crystal

Observation of an incommensurate structure by optical spectroscopy with a 5f ion as an internal probe. U4+–ThCl4 System

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Observation of an incommensurate structure by optical spectroscopy with a 5f ion as an internal probe. U⁴⁺–ThCl₄ System