Phys. Rev. Lett. 101, 017601 (2008) [4 pages]Microscopic Evidence of Spin State Order and Spin State Phase Separation in Layered Cobaltites RBaCo2O5.5 with R=Y, Tb, Dy, and HoReceived 9 January 2008; published 2 July 2008 We report muon-spin relaxation measurements on the magnetic structures of RBaCo2O5.5 with R=Y, Tb, Dy, and Ho. Three different phases, one ferrimagnetic and two antiferromagnetic, are identified below 300 K. They consist of different ordered spin state arrangements of high-, intermediate-, and low-spin Co3+ of CoO6 octahedra. Phase separation into well separated regions with different spin state order is observed in the antiferromagnetic phases. The unusual strongly anisotropic magnetoresistance and its onset at the FM-AFM phase boundary is explained. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.101.017601
DOI:
10.1103/PhysRevLett.101.017601
PACS:
76.75.+i, 75.25.+z, 75.30.−m, 75.47.−m
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