Does the formula v=Ldi/dt apply to materials with zero resistence, such as superconductors?
Your formula is the basic law on how inductors behave in electric circuits. Actually it's derived from a relation between magnetic and electric field, more specificly from the one that states how strong electric field is caused if magnetic field changes. That law is as valid in all materials and in the empty space.

Conclusion: Your formula is as valid in all circuits, no matter if some parts of it are superconductive.