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Phys. Rev. B 65, 180518(R) (2002) [3 pages]

Superconducting properties of BeB2.75

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D. P. Young, R. G. Goodrich, and P. W. Adams
Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803

Julia Y. Chan and Frank R. Fronczek
Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803

F. Drymiotis
National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32306

L. L. Henry
Department of Physics, Southern University, Baton Rouge, Louisiana 70813

Received 5 February 2002; published 9 May 2002

We present the low-temperature electronic transport properties of the intermetallic commonly known as BeB2. In contrast to the much simpler AlB2-type structure of the 39-K 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=0.72 K with a critical magnetic field Hc2=0.175 T. Isotopically pure 10.0B samples have an enhanced Tc=0.79 K. Hall-effect measurements suggest that the material is intrinsically compensated.

© 2002 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.65.180518
DOI:
10.1103/PhysRevB.65.180518
PACS:
74.70.Ad, 61.66.-f, 74.25.Fy, 74.62.Bf
 
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