Microscopic Evidence of Spin State Order and Spin State Phase Separation in Layered Cobaltites $R{\mathrm{BaCo}}_{2}{\mathrm{O}}_{5.5}$ with $R=$Y, Tb, Dy, and Ho
Abstract
We report muon-spin relaxation measurements on the magnetic structures of R BaCo2 O5.5 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. Show more
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Journal / series
Physical Review LettersVolume
Pages / Article No.
Publisher
American Physical SocietyOrganisational unit
02509 - Laboratorium für Neutronenstreuung (LNS) / Laboratory for Neutron Scattering (LNS)
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