期刊
PHYSICAL REVIEW LETTERS
卷 84, 期 13, 页码 2969-2972出版社
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.84.2969
关键词
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The oxygen-deficient double perovskite YBaCo2O5, containing corner-linked CoO5 square pyramids as principal building units, undergoes a paramagnetic to antiferromagnetic spin ordering at 330 K. This is accompanied by a tetragonal to orthorhombic distortion. Below 220 K orbital ordering and long-range Co2+/Co3+ charge ordering occur as well as a change in the Co2+ spin state from low to high spin. This transition is shown to be very sensitive to the oxygen content of the sample. To our knowledge this is the first observation of a spin-state transition induced by long-range orbital and charge ordering.
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