title: Crossover between magnetism and superconductivity in LaFeAsO with low H-doping level.
abstract: By making a systematic study of the hydrogen-doped LaFeAsO system by means of dc resistivity, dc magnetometry, and muon-spin spectroscopy, we addressed the question of universality of the phase diagram of rare-earth-1111 pnictides. In many respects, the behaviour of LaFeAsO(1-x)H(x) resembles that of its widely studied F-doped counterpart, with H(-) realizing a similar (or better) electron doping in the LaO planes. In an x = 0.01 sample we found a long-range spin-density wave (SDW) order with TN = 119 K, while at x = 0.05 the SDW establishes only at 38 K and, below Tc = 10 K, it coexists at a nanoscopic scale with bulk superconductivity. Unlike the abrupt magnetic-superconducting transition found in the La-1111 compound, the presence of a crossover region makes the H-doped system qualitatively similar to other Sm-1111, Ce-1111, and Nd-1111 families.
authors: CNR-SPIN and Università di Genova, via Dodecaneso 33, I-16146 Genova, Italy.
authors: G
authors: G
authors: Lamura
authors: T
authors: T
authors: Shiroka
authors: P
authors: P
authors: Bonfà
authors: S
authors: S
authors: Sanna
authors: R
authors: R
authors: De Renzi
authors: F
authors: F
authors: Caglieris
authors: M R
authors: MR
authors: Cimberle
authors: S
authors: S
authors: Iimura
authors: H
authors: H
authors: Hosono
authors: M
authors: M
authors: Putti