Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2003-04-25
Phys. Rev. Lett. 90, 227201 (2003)
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, 4 figures, accepted to Phys.Rev.Lett
Scientific paper
10.1103/PhysRevLett.90.227201
In RBaCo_{2}O_{5+x} compounds (R is rare earth), a ferromagnetic-antiferromagnetic competition is accompanied by a giant magnetoresistance. We study the magnetization of detwinned GdBaCo_{2}O_{5.5} single crystals, and find a remarkable uniaxial anisotropy of Co^{3+} spins which is tightly linked with the chain oxygen ordering in GdO_{0.5} planes. Reflecting the underlying oxygen order, CoO_2 planes also develop a spin-state order consisting of Co^{3+} ions in alternating rows of S=1 and S=0 states. The magnetic structure appears to be composed of weakly coupled ferromagnetic ladders with Ising-like moments, which gives a simple picture for magnetotransport phenomena.
Ando Yoichi
Lavrov Nicolay A.
Taskin Alexey A.
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