High Critical Current Density MgB
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چکیده
منابع مشابه
Dependence of the flux creep activation energy on current density and magnetic field for MgB 2 superconductor
Systematic ac susceptibility measurements have been performed on a MgB 2 bulk sample. We demonstrate that the flux creep activation energy is a non-linear function of the current density U (j) ∝ j −0.2 , indicating a nonlogarith-mic relaxation of the current density in this material. The dependence of the activation energy on the magnetic field is determined to be a power law U (B) ∝ B −1.33 , ...
متن کاملEnhancement of the critical current density in FeO-coated MgB2 thin films at high magnetic fields
The effect of depositing FeO nanoparticles with a diameter of 10 nm onto the surface of MgB(2) thin films on the critical current density was studied in comparison with the case of uncoated MgB(2) thin films. We calculated the superconducting critical current densities (J(c)) from the magnetization hysteresis (M-H) curves for both sets of samples and found that the J(c) value of FeO-coated film...
متن کامل1 Calculated elastic and electronic properties of MgB 2 at high pressures
The effect of high pressure on structural and electronic properties of the novel super-conductor MgB 2 has been calculated using the full-potential linearized augmented-plane-wave method. Despite the layered crystal structure of MgB 2 nearly isotropic compression (bulk modulus B 0 = 140.1(6) GPa) is found with only a 1.2% decrease of the c/a ratio at 10 GPa. The effect of pressure on the critic...
متن کاملCalculated elastic and electronic properties of MgB 2 at high pressures
The effect of high pressure on structural and electronic properties of the novel super-conductor MgB 2 has been calculated using the full-potential linearized augmented-plane-wave method. Despite the layered crystal structure of MgB 2 nearly isotropic compression (bulk modulus B 0 = 140.1(6) GPa) is found with only a 1.2% decrease of the c/a ratio at 10 GPa. The effect of pressure on the critic...
متن کامل1 Suppression of Superconducting Critical Current Density by Small Flux Jumps in MgB 2 Thin Films
By doing magnetization measurements during magnetic field sweeps on thin films of the new superconductor MgB2, it is found that in a low temperature and low field region small flux jumps are taking place. This effect strongly suppresses the central magnetization peak leading to reduced nominal superconducting critical current density at low temperatures. A borderline for this effect to occur is...
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