Static magnetic order and anisotropy of the layered cobalt dioxides Bi&lt;sub&gt;1.6&lt;/sub&gt;Pb&lt;sub&gt;0.4&lt;/sub&gt;Sr&lt;sub&gt;2&lt;/sub&gt;Co&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;&lt;em&gt;y&lt;/em&gt;&lt;/sub&gt; and Bi&lt;sub&gt;2&lt;/sub&gt;Sr&lt;sub&gt;2&lt;/sub&gt;Co&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;&lt;em&gt;y&lt;/em&gt;&lt;/sub&gt;

Sugiyama, Jun; Ikedo, Yutaka; Nozaki, Hiroshi; Russo, Peter L.; Brewer, Jess H.; Ansaldo, Eduardo J.; Morris, Gerald D.; Chow, Kim H.; Andreica, Daniel; Amato, Alex; Fujii, Takenori; Okada, Satoshi; Terasaki, Ichiro

doi:10.1016/j.physb.2008.11.176

Static magnetic order and anisotropy of the layered cobalt dioxides Bi_1.6Pb_0.4Sr₂Co₂O_y and Bi₂Sr₂Co₂O_y

Sugiyama J, Ikedo Y, Nozaki H, Russo PL, Brewer JH, Ansaldo EJ, Morris GD, Chow KH, Andreica D, Amato A, Fujii T, Okada S & Terasaki I

Citation

Sugiyama, J., Ikedo, Y., Nozaki, H., Russo, P. L., Brewer, J. H., Ansaldo, E. J., … Terasaki, I. (2009). Static magnetic order and anisotropy of the layered cobalt dioxides Bi_1.6Pb_0.4Sr₂Co₂O_y and Bi₂Sr₂Co₂O_y. Physica B: Condensed Matter, 404(5-7), 773-776. https://doi.org/10.1016/j.physb.2008.11.176

Persistent URL https://www.dora.lib4ri.ch/psi/islandora/object/psi:17318

The magnetism of a Pb-doped Bi₂Sr₂Co₂O_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.