We report the preparation method of and boron isotope effect for , a new binary intermetallic superconductor with a remarkably high superconducting transition temperature . Measurements of both temperature dependent magnetization and specific heat reveal a 1.0 K shift in between and . Whereas such a high transition temperature might imply exotic coupling mechanisms, the boron isotope effect in is consistent with the material being a phonon-mediated BCS superconductor.
- Received 30 January 2001
- Published in the issue dated 26 February 2001
© 2001 The American Physical Society