Abstract
Maximum-Entropy (ME) analysis is applied to muon-spin-rotation (μSR) data of RBa 2 Cu 3 O y (RBCO; R = Ho , Eu) vortex states. Our focus is on the prospect of antiferromagnetism (AF) associated with the vortex core. The ME transforms are fitted by two μSR signals: the vortex signal and the grain-boundary (GB) signal. Below Tc, the GB signals are well fitted by Gaussians for both EuBCO (Tc = 94 K ) and underdoped HoBCO (Tc = 66 K ). Below 0.5Tc, EuBCO and HoBCO vortex signals are best fitted using Lorentzians, instead of expected Gaussians. An estimate for an effective Neél temperature of an AF vortex core is about 30 K. Our AF-core search results for RBCO vortex states are discussed considering a magnetic origin of cuprate superconductivity.
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