Physics – Condensed Matter – Superconductivity
Scientific paper
2001-07-06
Phys. Rev. B 65, 024502 (2001)
Physics
Condensed Matter
Superconductivity
10 pages, 3 figures, submitted to Phys. Rev. B (July 6, 2001; revised September 27, 2001); discussion of the need for excess M
Scientific paper
10.1103/PhysRevB.65.024502
The resistivity and magnetoresistance in the normal state for bulk and thin-film MgB2 with different nominal compositions have been studied systematically. These samples show different temperature dependences of normal state resistivity and residual resistance ratios although their superconducting transition temperatures are nearly the same, except for the thin-film sample. The correlation between the residual resistance ratio (RRR) and the power law dependence of the low temperature resistivity, rho vs. T^c, indicates that the electron-phonon interaction is important. It is found that the magnetoresistance (MR) in the normal state scales well with the RRR, a0(MR) proportional to (RRR)^2.2 +/- 0.1 at 50 K. This accounts for the large difference in magnetoresistance reported by various groups, due to different defect scatterings in the samples.
Chen Hua-Xing
Chu Cheng-Wei
Meng R. L.
Wang Ya-Shu
Wang Yong-Qiang
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