Per this: https://aip.scitation.org/doi/abs/10.1063/1.99713 https://aip.scitation.org/doi/abs/10.1063/1.99713 Superconducting transition occurs between 86K to

Per this: https://aip.scitation.org/doi/abs/10.1063/1.99713 https://aip.scitation.org/doi/abs/10.1063/1.99713 Superconducting transition occurs between 86K to 94K, so liquid nitrogen would be more than sufficient for the task.