Effects of stoichiometry, purity, etching and distilling on resistance of MgB2 pellets and wire segments

Details Effects of stoichiometry, purity, etching and distilling on resistance of MgB2 pellets and wire segments Effects of stoichiometry, purity, etching and distilling on resistance of MgB2 pellets and wire segments

2002-04-23

arxiv.org/abs/cond-mat/0204510v1

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1016/S0921-4534(02)01840-3

We present a study of the effects of non-stoichiometry, boron purity, wire diameter and post-synthesis treatment (etching and Mg distilling) on the temperature dependent resistance and resistivity of sintered MgB2 pellets and wire segments. Whereas the residual resistivity ratio (RRR) varies between RRR \~ 4 to RRR > 20 for different boron purity, it is only moderately affected by non-stoichiometry (from 20% Mg deficiency to 20% Mg excess) and is apparently independent of wire diameter and presence of Mg metal traces on the wire surface. The obtained set of data indicates that RRR values in excess of 20 and residual resistivities as low as rho{0} ~ 0.4 mu Ohm cm are intrinsic material properties of high purity MgB2.

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