Boron Isotope Effect in Superconducting MgB2
Abstract
We report the preparation method of, and boron isotope effect for MgB2, a new binary intermetallic superconductor with a remarkably high superconducting transition temperature Tc(10B) = 40.2 K. Measurements of both temperature dependent magnetization and specific heat reveal a 1.0 K shift in Tc between Mg11B2 and Mg10B2. Whereas such a high transition temperature might imply exotic coupling mechanisms, the boron isotope effect in MgB2 is consistent with the material being a phonon-mediated BCS superconductor.
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