Abstract
Abstract The magnetism of a Pb-doped Bi 2 Sr 2 Co 2 O y (BSCO) crystal has been investigated by positive muon-spin rotation and relaxation ( μ + SR ) spectroscopy. Weak transverse field (wTF)- μ + SR measurements show that the whole sample enters into a magnetic state below ∼ 4.5 K . Combining the results of zero-field (ZF)- μ + SR experiment with susceptibility measurements, it is clarified that the sample is in a ferromagnetic ordered phase with a Curie temperature ( T C ) of 4.7 K and with the ordered internal magnetic field parallel to the c-axis within ∼ ± 15 ∘ . On the other hand, a pure BSCO crystal is also found to exhibit a bulk magnetic transition at 1.0 K by μ + SR . Since the relationship between the reduced T and reduced internal magnetic field for BSCO is almost equivalent to that for Pb-doped BSCO, the origin of the magnetic transition for both crystals is thought to be explained by common physics.
Published Version
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