Hole carrier in MgB2 characterized by Hall measurements

• DOI: 10.1063/1.1392979
• Publication Date: 2002-07-26T13:26:45Z
• Authors: W. N. Kang; C. U. Jung; Kijoon H. P. Kim; Min-Seok Park; S. Y. Lee; Hyeong-Jin Kim; Eun-Mi Choi; Kyung Hee Kim; Mun-Seog Kim; Sung-Ik Lee
• Keywords: Charge-carrier density

The longitudinal resistivity (ρxx) and Hall coefficient (RH) were measured for MgB2 sintered under high pressure. We found that RH is positive like cuprate high-Tc superconductors, decreases as the temperature increases 40 K <T<300 K. cotangent of angle was to follow a+bT2 behavior from Tc 300 At T=100 K, RH=4.1×10−11 m3/C which hole carrier density determined be 1.5×1023/cm3. This 1–2 orders magnitude larger than those Nb3Sn optimally doped YBa2Cu3Oy superconductors.