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Complex room-temperature ferrimagnetism induced by zigzag stripes of oxygen vacancies in Sr3YCo4O10+δ

DOI: 10.1103/PhysRevB.83.140403 DOI Help

Authors: D. D. Khalyavin (ISIS Facility, Rutherford Appleton Laboratory–STFC) , L. C. Chapon (ISIS Facility, Rutherford Appleton Laboratory–STFC) , E. Suard (Institut Laue-Langevin) , J. E. Parker (Diamond Light Source) , S. P. Thompson (Diamond Light Source) , A. A. Yaremchenko (Department of Ceramics and Glass Engineering, CICECO, University of Aveiro) , V. V. Kharton (Department of Ceramics and Glass Engineering, CICECO, University of Aveiro)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 83 (14) , PAGES 140403

State: Published (Approved)
Published: April 2011

Abstract: The high-temperature ferromagnetism in Sr3YCo4O10+δ perovskite, whose origin has been the subject of considerable debate, has been studied by neutron powder diffraction and synchrotron x-ray diffraction measurements. Oxygen vacancy ordering creates a complex pattern of zigzag stripes in the oxygen-deficient CoO4+δ layers, where the Co ions are found in three distinct coordinations. The symmetry of this unprecedented structural modulation, in conjunction with the existence of different Co spin states, provides a straightforward explanation for the appearance of ferrimagnetism. A model for the magnetic structure compatible with these structural features is proposed, based on the refinement of powder neutron data. The macroscopic moment as a function of temperature that can be calculated from the values of the ordered spins extracted from refinements is in excellent agreement with bulk magnetization. Unlike previous models, a collinear G-type magnetic structure with uncompensated moments due to distinct spin states of Co imposed by different coordination is found.

Subject Areas: Physics

Instruments: I11-High Resolution Powder Diffraction