My husband uses clotrimazole cream for his athlete's foot. Is that a good cream to use? What else can he use to cure it?

Athlete's foot. Yes that is a good cream. He needs to use it twice a day after washing his feet. Alternate at least two pairs of shoes, allowing the other to dry. Use anti fungal powder in his shoes. Keep his feet as dry as possible.
Good. There are many topical creams for this. If they are used correctly - see the package label and your docs advice - they have about the same efficacy. There may be a slight benefit to using terbinafine or naftifine. Keep feet clean and dry.