Muon spin relaxation studies of heavy fermion superconductors

This talk will focus recent developments in our understanding of heavy fermion (HF) superconductors and the role that positive muon spin relaxation (μSR) studies have played in helping to elucidate their properties. As illustrations two systems will be discussed: (1) UPd2Al3, one of the most recently discovered HF superconductors, which also displays coexisting magnetic order and (2) UBe3 doped with small quantities Of Th substituted for U, which displays an interplay between its superconducting and magnetic ground states, leading to multiple superconducting states