Effects of unreacted Mg impurities on the transport properties of MgB2

Details Effects of unreacted Mg impurities on the transport properties of MgB2 Effects of unreacted Mg impurities on the transport properties of MgB2

2002-06-26

arxiv.org/abs/cond-mat/0206518v1

Physica C. 377, 21 (2002).

Physics

Condensed Matter

Superconductivity

PhysicaC (in press), 4 page with 3 figures

Scientific paper

We synthesized polycrystalline MgB2 from a stoichiometric mixture of Mg and the 11 B isotope under different conditions. All the samples showed bulk superconductivity with Tc = 38~39 K. The samples containing the least amount of unreacted Mg showed the highest Tc and the sharpest transition width (Delta_Tc). A residual resistivity ratio (RRR) of ~ 5.8, and a magnetoresistance (MR), at 40 K, of 12% were obtained for these samples. Moreover, there was no upturn of resistivity in a low temperature region at 10 Tesla. The samples containing appreciable amounts of unreacted Mg showed quite different behaviors; the values of Delta_Tc, RRR, and MR were much larger. An upturn appeared in resistivity of the samples below about 50 K at 10 T and is thought to be due to the unreacted Mg.

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