Boron Isotope Effect in Superconducting MgB$_2$

Details Boron Isotope Effect in Superconducting MgB$_2$ Boron Isotope Effect in Superconducting MgB$_2$

2001-01-31

arxiv.org/abs/cond-mat/0101463v2

Phys. Rev. Lett., 86 (2001) 1877

Physics

Condensed Matter

Superconductivity

One figure and related discussion added

Scientific paper

10.1103/PhysRevLett.86.1877

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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