Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-09-20
Phys. Rev. B 83, 184420 (2011)
Physics
Condensed Matter
Strongly Correlated Electrons
9 pages, 5 figures, 3 tables
Scientific paper
10.1103/PhysRevB.83.184420
We have synthesized Sr$_6$Co$_5$O$_{15}$, a quasi-one-dimensional oxide, measured its magnetic properties and calculated its electronic structure by ab initio techniques. We have found strong evidence for its electronic and magnetic behavior not to follow the trend of its structural series. The magnetic coupling inside the CoO$_3$ chains is not purely ferromagnetic, the long-range coupling inside them is very weak. The Co moments are slightly canted due to their large orbital angular momenta being oriented along each particular quantization axis, that is different for each Co$^{4+}$ atom in the structure. Our thermopower calculations are in agreement with the experiment, supporting our model of the magnetic ground state of the compound.
Alonso Jose Antonio
Baldomir Daniel
Botana A. S.
Botta P. M.
la Calle C. de
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