Temperature- and magnetic-field-dependences of normal state resistivity of MgB$_{2}$ prepared at high temperature and high pressure condition

Abstract

We report the temperature- and magnetic-field-dependent resistivity of the recently discovered binary superconductor MgB$_{2}$. The superconducting transition width for the resistivity measurement was about 0.4 K, and the low-field magnetization showed a sharp superconducting transition with a transition width of about 1 K. The resistivity in the normal state followed $T^{2}$ behavior rather than $T^{3}$ as previously reported. Also, the resistivity did not change with the applied magnetic field, which was opposite to a previous report. Our reliable measurement was possible because we used a hard, dense sample prepared at high temperature and high pressure.