Muon spin relaxation study on magnetic properties of Nd2-xCexCuO4 around aboundary between the magnetically ordered and superconducting states

Zero-field and longitudinal-field muon spin relaxation (mu SR) measurements have been carried out in order to investigate magnetic properties of the e lectron-doped high-T-c oxides of Nd2-xCexCuO4 around a boundary between the magnetically ordered state and the superconducting one. A fast muon-spin d epolarizing component by a static internal field was observed in the oxygen -reduced superconducting single crystal with x = 0.15 below about 10 K, ind icating that a part of Cu and/or Nd spins shows a magnetically ordered stat e. The present mu SR study suggests a possibility of a coexisting or a phas e-separated state around x = 0.15. (C) 2001 Elsevier Science B.V. All right s reserved.