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Boron Isotope Effect in Superconducting MgB$_2$

S. L. Bud'ko·G. Lapertot·C. Petrovic·C. E. Cunningham·N. Anderson·P. C. Canfield
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Abstract

We report the preparation method of, and boron isotope effect for MgB$_2$, a new binary intermetallic superconductor with a remarkably high superconducting transition temperature $T_c$($^{10}$B) = 40.2 K. Measurements of both temperature dependent magnetization and specific heat reveal a 1.0 K shift in $T_c$ between Mg$^{11}$B$_2$ and Mg$^{10}$B$_2$. Whereas such a high transition temperature might imply exotic coupling mechanisms, the boron isotope effect in MgB$_2$ is consistent with the material being a phonon-mediated BCS superconductor.

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S. L. Bud'ko, G. Lapertot, C. Petrovic, C. E. Cunningham, N. Anderson, P. C. Canfield. 2001-02-03. Boron Isotope Effect in Superconducting MgB$_2$. https://doi.org/10.1103/physrevlett.86.1877

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