[en] We present a comparative feasibility study of various coil construction concepts for the non-destructive generation of 100 T fields, based on the characteristics of the most suitable magnet wire and the strongest reinforcement composites. Presently, the nested coil system (coilin/coilex) is the most promising. The optimum design uses a conventional large 60 T coil for coilex and a 40 T coil of the Leuven type for coilin, that is to say a coil which has an optimized internal reinforcement. (orig.)

[en] Cyclotron resonance measurements of holes in cadmium antimonide are presented. The effective cyclotron mass values were obtained for the magnetic field parallel to the a, b, and c axes of the orthorhombic crystal. The experiment was carried out in a spectrometer using a pulsed magnet up to 35 T and submillimeter laser sources at the wavelengths 337, 195, and 119 μm, respectively. The measurements give the following effective cyclotron mass ratios when the excitation is 337 μm and B is parallel to the a, b, and c axes, respectively: m/sub a//m₀ = 0.275, m/sub b//m₀ = 0.180, and m/sub c//m₀ = 0.414. The cyclotron masses decrease when increasing the excitation energy

[en] First evidence is given of the fundamental spin-resolved transition O^-O⁺ in InSb, which proves, in this material, the existence of spin-flip phonon assisted transitions. (author)

[en] We measure the Hall conductivity, σ_xy , on a Corbino geometry sample of a high-mobility AlGaAs/GaAs heterostructure in a pulsed magnetic field. At a bath temperature about 80mK, we observe well expressed plateaux in σ_xy at integer filling factors. In the pulsed magnetic field, the Laughlin condition of the phase coherence of the electron wave functions is strongly violated and, hence, is not crucial for σ_xy quantization

[en] The production of long pulsed high fields (> 500 kgaus) with (tau > 1 s) with cryogenic coils requires an initial energy source of several megajoules. Iron free asynchronous pulsed generators are particulary well adapted to this application as they are able to produce this energy at a very competitive price

[en] The shape evolution of conductors is investigated when axial and radial sinusoidal fluctuations appear simultaneously on the cylindrical surface of a stressed surface. An energy variation calculation is performed to determine the theoretical wavelengths of these oscillations, while the profile of the surface is predicted. A study of the rod surface kinetics is also performed to characterize the evolution of the roughness vs time. The results are compared with the experimental observations of the interface of copper/tantalum conductors. The good agreement between the theory and the experiment confirms the interpretation of the phenomenon in terms of Grinfeld instabilities

[en] The YBa₂Cu₃O₇ compound has been prepared as a single-phase material. It exhibits a sharp superconducting transition around 93 K which is observed consistently by resistance and magnetic-susceptibility experiments. Upper critical fields H_c2 have been measured just below T_c up to 42T, using a high pulsed magnetic field. We conclude that the H_c2 value at 77K is about 80T and that the extrapolated value at O.OK could exceed 250T

[en] We present high-field magnetoresistance measurements on a series of V/sub 1-//sub x/Si/sub x/ amorphous alloys with high Si content (0.50 ≤ x ≤ 0.86). For alloys with x ≤ 0.75 the magnetoresistance-versus-field curves are characteristic of weak localization effects in the presence of strong spin-orbit coupling despite rather low values of the disorder parameter. But a tentative fit of experimental curves at high field from model equations is made difficult on the one hand by the electron-electron interaction term becoming important at high field and on the other hand by the possible inadequacy of model formulations of weak localization effects in the high H/T limit. However, reasonable values for the inelastic and spin-orbit relaxation times are tentatively proposed. Due to phase separation occurring for x ≥ 0.82, the metal-nonmetal transition could not be observed

[en] We correlate the lowering of Tsub(c) due to the introduction of magnetic atoms of praseodymium in the amorphous matrix La₇₅Al₂₅ and La₇₅Ga₂₅, with crystal field effects around Pr³⁺

[en] Measurements of the resistivity, together with the longitudinal and transverse magnetoresistances of YBa₂Cu₃O₇ in extremely high fields up to 430 kG at different temperatures (4.2--300 K) are reported. It is shown that the application of a field as high as 430 kG does not destroy superconductivity at 50 K. Moreover the resistance at 77 K and 430 kG does not approach the saturation limit and is only --50% of that of the normal phase. A large negative and anisotropic magnetoresistance Δrho is observed at high temperatures (T>100 K). It is suggested that this behavior could be either of magnetic origin or due to some influence of the electromagnetic field on the short-range order of oxygen ions