Phys. Rev. Lett. 89, 286602 (2002) [4 pages]Ultrasharp Magnetization Steps in Perovskite ManganitesReceived 12 June 2002; published 30 December 2002 We report a detailed study of steplike metamagnetic transitions in polycrystalline Pr0.5Ca0.5Mn0.95Co0.05O3. The steps have a sudden onset below a critical temperature, are extremely sharp (width <2×10-4 T), and occur at critical fields which are linearly dependent on the absolute value of the cooling field in which the sample is prepared. Similar transitions are also observed at low temperature in non-Co doped manganites, including single crystal samples. These data show that the steps are an intrinsic property, qualitatively different from either previously observed higher temperature metamagnetic transitions in the manganites or metamagnetic transitions observed in other materials. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.89.286602
DOI:
10.1103/PhysRevLett.89.286602
PACS:
72.15.Gd, 75.60.–d
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