Abstract
Muon-spin-resonance (μSR) vortex data of underdoped Bi2Sr2CaCu2Ox (Bi2212) and Tl2Ba2Ca2Cu3Oy (Tl2223) have been analyzed to search for antiferromagnetism in and around their vortex cores. The temperature-dependent magnetic field distributions in the vortex states are obtained by maximum-entropy μSR analysis. The grain-boundary signal is well fitted by a narrow Gaussian. For the vortex μSR signals, deviations from a Gaussian are observed well below Tc, especially at the high-field side associated with the vortex core. For both Bi2212 and Tl2223, Lorentzians fit the μSR vortex signals better below 0.4 Tc, indicating that extra magnetic fields occur near and in the vortex cores. An estimated Neél temperature is 0.4 Tc. Our vortex-μSR results are compared with those of RBa2Cu3O7−δ (R=Eu,Ho,Y). The relevance to a potential magnetic origin of cuprate superconductivity is discussed.
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