Superconducting isotope effect in ZrB12
Published Web Locationhttps://doi.org/10.1016/0375-9601(71)90486-5
The Zr isotope effect appears to be much stronger in ZrB12 than in elemental Zr (the B isotope effect in ZrB12 is known to be small). The superconductivity of ZrB12 is apparently caused by optical phonon modes associated with the internal motion of Zr atoms inside boron cages. © 1971.