NMR on doped MgB2 in the normal and in the superconducting state
نویسندگان
چکیده
R. W. Bounds,1 E. Pavarini,2,3 M. Paolella,4 E. Young,4 I. Heinmaa,5 R. Stern,5 and M. Carravetta1,* 1School of Chemistry, University of Southampton, Southampton SO17 1BJ, United Kingdom 2Institute for Advanced Simulation, Forschungszentrum Jülich, D-52425 Jülich, Germany 3JARA High-Performace Computing, RWTH Aachen, 52062 Aachen, Germany 4Institute of Cryogenics, School of Engineering Sciences, University of Southampton, Southampton SO17 1BJ, United Kingdom 5National Institute of Chemical Physics and Biophysics, Tallinn 12618, Estonia
منابع مشابه
Fabrication of Chemically Doped, High Upper Critical Field Magnesium Diboride Superconducting Wires
Controlled chemical doping of magnesium diboride (MgB2) has been shown to substantially improve its superconducting properties to the levels required for high field magnets, but the doping is difficult to accomplish through the usual route of solid state reaction and diffusion. Further, superconducting cables of MgB2 are difficult to fabricate because of the friable nature of the material. In t...
متن کاملابررسانایی دمای بالا در حالت آلاییدگی بهینه
Intensive study of the high temperature superconductors has been ongoing for two decades. A great deal of this effort has been devoted to the underdoped regime, where the new and difficult physics of the doped Mott insulator has met extra complications including bilayer coupling/splitting, shadow bands, and hot spots. While these complications continue to unfold, in this short overview the fo...
متن کاملEffects of the sintering temperature on the flux-pinning mechanism and the activation energy of malic-acid doped MgB2
The flux-pinning mechanism and activation energy of 10 wt % malic acid-doped MgB2 were investigated by measuring of the critical current density and resistivity as a function of magnetic field and temperature. A crossover field, Bsb, was observed from the single vortex to the small vortex bundle pinning regime. For the sintered sample, the temperature dependence of Bsb(T) at low temperature i...
متن کاملپیشرفتهای اخیر در زمینه ساخت سیم و نوار ابررسانای MgB2
MgB2 wire and tape were prepared using the powder in tube and reaction in-situ technique. All samples were characterized using the XRD, SEM, TEM, as well as transport and magnetic measurements. High transport and magnetic critical current density values have been obtained for metal-clad wires and tapes. Different sheath materials have been examined, but Fe appears to be the best sheath for MgB...
متن کاملعلائم ابررسانایی دانهای و اثرهای جوزفسون در اندازهگیریهای ماکروسکوپی: ابررساناهای جدید
We report systematic investigations of the magnetic superconducting properties of the new superconducting materials (NS): New high temperature superconductors (HTS), Organic superconductors (OS), fullerenes, carbon nanotubes, MgB2 etc. We show that, contrary to conventional superconductors where the superconducting state can be coherent over several tenths of km, the macroscopic coherence ran...
متن کامل