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Condensed Matter > Superconductivity

Title: Boron Isotope Effect in Superconducting MgB$_2$

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.
Comments: One figure and related discussion added
Subjects: Superconductivity (cond-mat.supr-con)
Journal reference: Phys. Rev. Lett., 86 (2001) 1877
DOI: 10.1103/PhysRevLett.86.1877
Cite as: arXiv:cond-mat/0101463 [cond-mat.supr-con]
  (or arXiv:cond-mat/0101463v2 [cond-mat.supr-con] for this version)

Submission history

From: S. L. Bud'ko [view email]
[v1] Wed, 31 Jan 2001 03:46:12 GMT (52kb)
[v2] Sat, 3 Feb 2001 14:47:11 GMT (63kb)