Preparation and properties of amorphous MgB2/MgO superstructures: A new model disordered superconductor
نویسندگان
چکیده
W. Siemons, 2 M.A. Steiner, 3, ∗ G. Koster, 2 D.H.A. Blank, M.R. Beasley, 3 and A. Kapitulnik 3, 4 Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California, 94305 Faculty of Science and Technology and MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE, Enschede, The Netherlands Department of Applied Physics, Stanford University, Stanford, CA 94305 Department of Physics, Stanford University, Stanford, CA 94305 (Dated: February 2, 2008)
منابع مشابه
Preparation and properties of amorphous MgB2 ÕMgO superstructures: Model disordered superconductor
W. Siemons,1,2 M. A. Steiner,1,3,* G. Koster,1,2 D. H. A. Blank,2 M. R. Beasley,1,3 and A. Kapitulnik1,3,4 1Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA 2Faculty of Science and Technology and MESA Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands 3Department of Applied Physics, Stanford Universi...
متن کاملEnhancing superconducting properties of MgB2 pellets by addition of amorphous magnetic Ni-Co-B nanoparticles
Amorphous magnetic Ni-Co-B nanoparticles with an average size of 5 nm were added to precursor powders of MgB2 superconductor. The preparation procedure for MgB2 pellets was optimized for obtaining the best critical current density ( Jc) at elevated magnetic fields. Addition of Ni-Co-B decreases the Jc for heat treatment of precursor powders at 650 ° C. Heat treatments at 770 ° C and higher impr...
متن کاملInterplay between boron precursors and Ni-Co-B nanoparticle doping in the fabrication of MgB2 superconductor with improved electromagnetic properties
The influence of different boron precursor powders on the critical current density of MgB2 superconductor with added Ni-Co-B nanoparticles is investigated. Different types of boron have different morphologies, particle sizes and impurity content, all of which have a strong impact on the critical current density ( Jc). The boron samples investigated in this study include three different boron po...
متن کاملTunneling spectroscopy and magnetization measurements of the superconductor properties of MgB2
Cryogenic scanning tunneling microscopy and magnetization measurements were used to study the superconducting properties of MgB2. The magnetization measurements show a sharp superconductor transition at Tc = 39K, in agreement with previous works. The tunneling spectra exhibit BCS gap structures, with gap parameters in the range of 5 to 7 meV, yielding a ratio of 2∆/kBTc ∼ 3− 4. This suggests th...
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