Regarding Tc of MgB2

[roxana]

Hi Sandeep,

Could you be more explicit on what are the suggestions/comments you need?

As Hari pointed out in his reply is that the Tc value you provide is obtained with the Allen-Dynes formula (I missed that when I looked over your first post). Allen-Dynes formula or the isotropic Migdal-Eliashberg will give you a value which is roughly a factor of 2 smaller than the anisotropic Migdal-Eliashberg in the case of MgB2. This is because MgB2 is a two-gap superconductor, so isotropic calculations cannot properly describe the superconducting gap structure. A discussion on this topic is given in the reference provided by Hari.

Best,
Roxana