Structure and Superconducting Properties of "BeB2"
Abstract
We present the crystal structure and low temperature electronic transport properties of the intermetallic commonly known as BeB2. In contrast to the much simpler AlB2-type structure of the 39K superconductor MgB2, BeB2 forms a complex structure type that is nearly unique in nature. The structure has 110.5 atoms per unit cell and a stoichiometry BeB2.75. Polycrystalline Be(10.8B)2.75 is superconducting below Tc=0.72K with a critical magnetic field Hc2=0.175T. Isotopically pure 10.0B samples of have an enhanced$Tc=0.79K, consistent with a BCS isotope effect. Hall effect measurements suggest that the material is intrinsically compensated.
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