ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
The rare-earth (R) magnetism and grain-size dependencies of magnetic field distributions in RBa2Cu3O7−δ (RBCO) vortex states have been studied. A maximum-entropy technique has been applied to transverse field muon-spin-relaxation data of several polycrystalline cuprate superconductors. The main vortex signals for R=Er, Gd, and Ho reveal signs of two peaks in the field distribution below the applied field (Bext=1 kOe) as predicted for d-wave superconductivity. For the RBCO (R=Er, Gd, Ho, Eu, Y) vortex states, we have confirmed low-field tails in the field distributions well below Bext. The low-field tail may be caused by magnetic frustration in the vortex state or possible CuO-chain superconductivity below 25 K. Any interpretation of these (magnetic) vortex anomalies should comprise unconventional non-Bardeen–Cooper–Schrieffer-like fundamental properties of the cuprate vortex states. © 1998 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.367907
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