title: Nanoscopic coexistence of magnetism and superconductivity in YBa2Cu3O6+x detected by muon spin rotation.
abstract: We performed zero and transverse field muon spin rotation experiments on a large number of YBa2Cu3O6+x samples. We detect the coexistence of antiferromagnetic (AF) short range magnetism with superconductivity below T(f) < or = 10 K in compositions 0.37 < or = x < or = 0.39. Most muons experience local AF fields, even when a SQUID detects a full superconducting volume fraction, which points to a local minimal interference organization of short AF stripes embedded in the superconductor. A detailed phase diagram is produced and the consequences of the minimal interference are discussed.
authors.affiliation: Dipartimento di Fisica e Unità INFM di Cagliari, I 09042 Monserrato (Ca), Italy.
authors.forename: S
authors.initials: S
authors.lastname: Sanna
authors.forename: G
authors.initials: G
authors.lastname: Allodi
authors.forename: G
authors.initials: G
authors.lastname: Concas
authors.forename: A D
authors.initials: AD
authors.lastname: Hillier
authors.forename: R
authors.initials: R
authors.lastname: De Renzi