Abstract
Highly c-axis oriented MgB 2 thin films with T c onset of 39.6 K were fabricated by magnesium diffusing into pulsed laser deposited boron precursors. Estimation of critical current density J c, using hysteresis loops and the Bean model, gave the value of 10 7 A/cm 2 (15 K, 0 T), which is one of the highest values ever reported. The X-ray photoemission spectra of the MgB 2 thin film revealed the binding energy of Mg 2p and B 1s are at 49.4 and 186.9 eV, respectively. The Raman spectra showed a typical broad band centered at 620 cm −1 with shoulders at 294, 410 and 730 cm −1 respectively. The dominant band at 620 cm −1 is interpreted as the first-order Raman response from the E 2g phonon of MgB 2 and the other three bands are properly originated from the phone density of states in MgB 2.
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