Antiferromagnetism in water doped YBa2Cu3O6+x for x∼0.5

Abstract We report zero-field (ZF) μSR on a series of antiferromagnetic (AFM) samples of YBa 2 Cu 3 O 6.4 reacted with water. We find several oscillating signals whose amplitudes vary with water content and temperature, and for high water contents, a non-oscillating component. The Neel transition is 395(5) K, characteristic of the undoped CuO 2 bilayer. Initial comparison with ZFμSR and ZFNMR measurements in related AFMs ( PrBa 2 Cu 3 O 7 and H doped YBa 2 Cu 3 O 7 ) suggests a similar muon site and an AF structure which is similar, but distinct from YBa 2 Cu 3 O 6 .