Hole carrier of MgB_{2} determined by the Hall Measurement

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  • 19 February 2001
Abstract
The longitudinal resistivity rho_{xx} and Hall coefficient R_H were measured for MgB2 sintered under high pressure. We found that R_H is positive like cuprate high-Tc superconductors. The R_H decreases as the temperature increases for 40 K < T < 300 K. And cotangent of Hall angle was found to follow a+bT^2 behavior from Tc to 300 K. At T = 100 K, R_H = 4.3 x 10^{-11} m^3/Coulomb and the hole carrier density was 1.5 x 10^{23}/cm^3. This hole carrier density is 2-3 order of magnitude larger than those of Nb3Sn superconductor and optimally doped YBa_2Cu_3O_y.

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