Microscopic Evidence of Spin State Order and Spin State Phase Separation in Layered Cobaltites RBaCo2O5.5 with R=Y, Tb, Dy, and Ho

Abstract

We report muon spin relaxation measurements on the magnetic structures of RBaCo_2O_5.5 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 Co^3+ of CoO_6 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.

4 pages, accepted for publication in Phys. Rev. Lett

References in corpus (12)

• Transport and magnetic properties of GdBaCo_{2}O_{5+x} single crystals: A cobalt oxide with square-lattice CoO_2 planes over a wide range of electron and hole doping
• Muon spin rotation and relaxation in magnetic materials
• Ising-like Spin Anisotropy and Competing Antiferromagnetic - Ferromagnetic Orders in GdBaCo_{2}O_{5.5} Single Crystals
• Spin structure and magnetic phase transitions in TbBaCo2O5.5
• Magnetic Structures of High Temperature Phases of TbBaCo2O5.5
• Electron-Hole Asymmetry in GdBaCo_{2}O_{5+x}: Evidence for Spin Blockade of Electron Transport in a Correlated Electron System
• Spin state and phase competition in TbBaCo_{2}O_{5.5} and the lanthanide series LnBaCo_{2}O_{5+δ} (0<=δ<=1)
• X-ray Diffraction Study of Superstructure in GdBaCo2O5.5
• Magnetization and Magnetotransport of LnBaCo2O5.5 (Ln=Gd, Eu) Single Crystals
• First principles study of the spin state transitions in GdBaCo${}_2$O${}_{5.5}$
• X-ray and neutron diffraction studies of coupled structural phase transitions in DyBaCo${}_2$O${}_{5.5}$
• Metal insulator transition in TlSr2CoO5 from orbital degeneracy and spin disproportionation

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