Low field critical current density of titanium sheathed magnesium diboride wires
نویسندگان
چکیده
منابع مشابه
Pair-breaking critical current density of magnesium diboride
We report the investigation of the pair-breaking current density jd in magnesium diboride. At low current densities j, the transition temperature Tc shifts in the classic DTc( j)/Tc(0)}2@ j / jd(0)# 2/3 manner, with a projected jd(0)'2310 7 A/cm. Current-voltage curves at fixed temperatures yield a similar value for jd(0), with an overall jd(T) dependence consistent with Ginzburg-Landau theory....
متن کاملFabrication 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 کاملRole of internal gases and creep of Ag in controlling the critical current density of Ag-sheathed Bi2Sr2CaCu2Ox wires
High engineering critical current density JE of > 500A/mm 2 at 20T and 4.2K can be regularly achieved in Ag-sheathed multifilamentary Bi2Sr2CaCu2Ox (Bi-2212) round wire when the sample length is several centimeters. However, JE(20T) in Bi-2212 wires of several meters length, as well as longer pieces wound in coils, rarely exceeds 200A/mm. Moreover, long-length wires often exhibit signs of Bi-22...
متن کاملCritical flux pinning and enhanced upper critical field in magnesium diboride films
We have conducted pulsed transport measurements on c-axis-oriented magnesium diboride films over the entire relevant ranges of magnetic field 0&H&Hc2 ~where Hc2 is the upper critical field! and current density 0& j& jd ~where jd;10 7 A/cm is the depairing current density!. The intrinsic disorder of the films combined with the large coherence length and three dimensionality, compared to cuprate ...
متن کاملInfluence of the iron sheath on the local supercurrent distribution in MgB2 wires
The magnetic behavior of iron sheathed magnesium diboride (MgB2) wires was investigated. Global magnetization measurements have shown unusual critical current density variations compare to a superconductor with no magnetic environment. Local quantitative studies, through MO images, are linked to these global magnetization measurements in order to better understand the observed results. It is sh...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Physics: Conference Series
سال: 2010
ISSN: 1742-6596
DOI: 10.1088/1742-6596/234/2/022029