Structure and Superconducting Properties of "BeB_2"

Abstract

We present the crystal structure and low temperature electronic transport properties of the intermetallic commonly known as BeB_2. In contrast to the much simpler AlB_2-type structure of the 39K superconductor MgB_2, BeB_2 forms a complex structure type that is nearly unique in nature. The structure has 110.5 atoms per unit cell and a stoichiometry BeB_{2.75}. Polycrystalline Be(^{10.8}B)_{2.75} is superconducting below T_c=0.72K with a critical magnetic field H_{c2}=0.175T. Isotopically pure ^{10.0}B samples of have an enhanced$T_c=0.79K, consistent with a BCS isotope effect. Hall effect measurements suggest that the material is intrinsically compensated.

submitted to PRL

References in corpus (5)

• Boron Isotope Effect in Superconducting MgB${}_2$
• Thermodynamic and Transport Properties of Superconducting $M{g}^{10}{B}_2$
• Electronic structure of superconducting MgB2 and related binary and ternary borides
• Hole Superconductivity in $Mg{B}_2$: a high $T_c$ cuprate without Cu
• Absence of Superconductivity in BeB2

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• Superconductivity in the Mo_2Re_3B compound
• Prediction of fundamental properties of Be-B-Ta based novel ternary compounds from first-principles calculations