No abstract available

[en] The magnetization M of single crystalline TmB₄ has been investigated in high magnetic fields up to 54 T and shows considerably anisotropic behavior. In the ordered antiferromagnetic state, the M for B parallel [001] reaches the saturation magnetization M_s at about 4 T accompanying with plateaux at 1/8 M_s and 1/2 M_s. On the other hand, for B parallel [100] and [110], the 1/2 M_s state and the saturation of M were observed at much higher field above 30 T. The results are discussed in relation to the effects of magnetic frustration and the crystalline electric field

[en] The ground state of the appropriate generalization of the impurity Anderson model for valence fluctuations between two realistic Tm⁺² and Tm⁺³ configurations is obtained, in the narrowband limit, using the Lanczos' method. This limit describes the strong-coupling fixed point of renormalization group treatments for intermediate valence and Kondo impurities. The resulting ground state is highly degenerate and contains states of total angular momentum 0, 3/2, 2, 5/2, 4 and 9/2. The crystal electric field or an applied magnetic field should split the degeneracy favouring the magnetic states. As found in TmSe, the Tm magnetic moment is anomalously small

No abstract available

[en] Short note. 1 ref

[en] The ground state of the appropriate generalization of the impurity Anderson model for valence fluctuations between two realistic Tm⁺² and Tm⁺³ configurations is obtained in the atomic, narrow band limit, using the Lanczos' method. This limit describes the strong-coupling fixed point of renormalization-group treatments for intermediate valence and Kondo impurities. The resulting ground state is highly-degenerate and contains states of total angular momentum 0, 3/2, 2, 5/2, 4 and 9/2. The crystal electric field or an applied magnetic field should split the degeneracy favouring the magnetic states. As found in TmSe, the Tm magnetic moment is anomalously small. (Author)

No abstract available

[en] Spectral investigation of Tm³⁺ in thulium nitrate has been carried out. For the first time, the second derivative spectrum of this complex has been recorded. The results of a least squares fit of the energy levels and oscillator strengths of the bands are reported in terms of interaction parameters and Judd-Ofelt parameters. Radiative transition probabilities for fluorescence levels ³P₀, ¹I₆, ¹D₂ and ¹G₄ of Tm³⁺ in thulium nitrate are estimated. (author)

[en] We will present how it is possible, from EXAFS spectroscopy, to estimate atomic relaxation effects even in homogeneous mixed valent compounds, for which these relaxations are known to be very small. EXAFS experiments, analysed by our procedure, can then be used to decide if the ground state is homogeneous or inhomogeneous. At least, the procedure will be applied to the Tm_xSe system. We conclude that the homogeneous character of the mixed valent state is preserved in the non-stoichiometric compounds

[en] The interaction in HoI₃-NaI, HoI₃-CsI, TmI₃-CsI, ScI₃-NdI, Sc₃-KI, ScI₃-RbI systems was studied by the method of differential thermal and X-ray phase analysis. According to the results of the differential thermal analysis, HoI₃-NaI and ScI₃-NaI systems were classed with the eutectic type. However, the X-ray phase analysis revealed the presence of a new phase in the solid state of alloys containing approximately 75 mol% NaI. One chemical compound (K₃Sc-I₆) was found in the ScI₃-KI system and two chemical compounds of Me₃LnI₆ and Me₃Ln₂I₉(Me-Cs, Rb; Ln-Ho, Tm, Sc) type were found in each of HoI₃-CsI, TmI₃-CsI, ScI₃-RbI systems