Magnetism and candidate muon-probe sites in RBa2Cu3Oy
Abstract
Key results of zero-field (ZF) and transverse-field (TF) muon-spin-relaxation (μSR) experiments on superconducting and insulating RBa2Cu3Oy (R123y, with R=Eu, Gd, Pr and Pr/Y:y=6, 7) are examined. The chemical behavior of the positive muon probe is addressed, and muon-oxygen bonding is shown to occur in all these cuprates. To explain magnetic fields at muon-probe sites in PrxY1‑xBa2Cu3Oy (0<=x<0.5,y=7 andx=0,y=6) samples, improvements on the reported magnetic structures from neutron diffraction are necessary. Cu magnetism in Pr123y (y=6,7) is observed belowTN1, which is near RT. The magnetism seen belowTN2 can be interpreted assuming an additional ordering in the Cutt-O chain layers. Alternatively, Pr ordering is also considered as the cause of the second phase transition. Considering the specific muon-probe location, a more detailed interpretation can be provided for the μSR parameters, measured in the normal and mixed states of these unconventional superconductors.
- Publication:
-
Hyperfine Interactions
- Pub Date:
- February 1991
- DOI:
- 10.1007/BF02396006
- Bibcode:
- 1991HyInt..63..219D
- Keywords:
-
- Magnetic Field;
- Thin Film;
- Phase Transition;
- Mixed State;
- Neutron Diffraction