# Chapter 7: Superconductivity¶

## Example 7.3.1, Page number 7-6¶

In :
import math

#Variable declaration
Ho = 2.*10**5   #A/m
Hc = 1.*10**5   #A/m
T = 8.          #temperature(K)

#Calculations
Tc = math.sqrt(T**2/(1-(Hc/Ho)))

#Result
print "Critical temperature =",round(Tc,3),"K"

Critical temperature = 11.314 K


## Example 7.3.2, Page number 7-7¶

In :
import math

#Variable declaration
Bo = 0.0306   #Critical field at 0K(T)
Tc = 3.7      #critical temperature(K)
T = 2         #K

#calculation
Bc = Bo*(1-((T/Tc)**2))

#Result
print "Critical field at 2K is",round(Bc,5),"T"

Critical field at 2K is 0.02166 T


## Example 7.3.3, Page number 7-7¶

In :
import math

#Variable declaration
Ho = 6.5*10**4   #Critical field at 0K(T)
Tc = 7.18        #critical temperature(K)
T = 4.2          #K

#calculation
Hc = Ho*(1-((T/Tc)**2))
Ic = 2*math.pi*r*Hc

#Result
print "Critical current =",round(Ic,2),"A"

Critical current = 134.33 A


## Example 7.3.4, Page number 7-8¶

In :
#Variable declaration
Tc1 = 4.185      #critical temperature(K)
M1 = 199.5       #isotopic mass
Tc2 = 4.133      #K

#calculation
M2 = ((Tc1*M1**0.5)/Tc2)**2

#Result
print "Isotopic mass =",round(M2,2)

Isotopic mass = 204.55