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Tc= thetaD/1.45 {-1.04(1+lamda)/[ lamda – mu*(1+ 0.62 lamda)]}

trying to find the critical temperature Tc for a superconducting system I only have three given quantities:

thetaD= 750 K (debye temp)

Lamda= 1.04 (the electron-phonon coupling constant)

N(Ef)= 18.26 state/atom.eV (density of states DOS)

I'm not still sure of this If it's correct or not cause I found many other formulas with different details. offcourse I get this formula from the net, I first choose mu*= 0.1 as most solutions but the prophesier said it's wrong to choose it arbitrarily I have to calculate mu* using the density of state. so I searched the net to find an equation that relates mu* to DOS I found one, but it was very complicated with another unknown quantities like the volume (volume of what, how can I find it from the given numbers and as far as I know the volume of the lattice- assume- couldn't be calculated from them) It's like self learning of something completly new and never taught before -mybe that's why I couldn't find a way to figure that out. I tried for a week before typing this. I really need to do this please help If any one can, I appreciate all the help I'll have.

Desperate physicist