Coexisting Static Magnetic Order And Superconductivity In Cecu2.1si2 Found By Muon Spin Relaxation

Zero- and longitudinal-field muon-spin-relaxation measurements on a heavy-fermion system ${\\mathrm{CeCu}}_{2.1}$${\\mathrm{Si}}_{2}$ have revealed an onset of static magnetic ordering below ${T}_{M}$\\ensuremath{\\sim}0.8 K, which coexists with superconductivity below ${T}_{C}$=0.7 K. The line shapes of the observed muon spin depolarization functions suggest an ordering in either the spin-glass or incommensurate spin-density-wave states, with a small averaged static moment of the order of 0.1${\\ensuremath{\\mu}}_{B}$ per formula unit at T\\ensuremath{\\rightarrow}0.