Physics – Condensed Matter – Superconductivity
Scientific paper
2001-02-09
Appl. Phys. Lett. V78, 2914(2001)
Physics
Condensed Matter
Superconductivity
3Pages PDF
Scientific paper
10.1063/1.1371239
High-density bulk materials of a newly discovered 40K intermetallic MgB2 superconductor were prepared by high pressure sintering. Superconducting transition with the onset temperature of 39K was confirmed by both magnetic and resistive measurements. Magnetization versus field (M-H) curve shows the behavior of a typical Type II superconductor and the lower critical field Hc1(0) estimated from M-H curve is 0.032T. The bulk sample shows good connection between grains and critical current density Jc estimated from the magnetization hysteresis using sample size was 2x104A/cm2 at 20K and 1T. Upper critical field Hc2(0) determined by extrapolating the onset of resistive transition and assuming a dirty limit is 18T.
Fujii Hirofumi
Hatano Takafumi
Ihara Hideshi
Kito Hideo
Kumakura Hiroaki
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