Nanoscale magnetic inhomogeneities in the triple A-site columnar ordered quadruple perovskites RMn3O6 (R = Y or Dy)
The YMn3O6 and DyMn3O6 quadruple perovskite manganese oxides have a rich and varied magnetic phase diagram. In Y0.89Mn3.11O6, Y0.92Mn3.08O6 and Dy1.03Mn2.97O6 we observe the experimental signatures of a Griffiths phase from DC magnetometry measurements, which we believe to originate from spin doping, analogous to the emergence of a Griffiths phase in the simple perovskite oxides from charge doping. Following neutron diffraction measurements we have determined that YMn3O6 adopts a long range ordered ferrimagnetic structure, which succeeds the Griffiths phase and persists down to the lowest measured temperature. In comparison no long range order has been observed in Dy1.03Mn2.97O6, and instead broad diffuse scattering is observed that is indicative of short range order. Furthermore the appearance of short range order is observed from ~30 K in both YMn3O6 samples. We propose a SANS experiment to directly observe and determine the nature of the Griffiths phase and the low temperature short range clustered phase. This experiment will be crucial in building the magnetic phase diagram of these systems, and would be a novel observation of a Griffiths phase induced by spin doping.
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JOHNSON Roger; CUBITT Robert; SCATENA Rebecca; STEINKE Nina-Juliane and A. M. Vibhakar. (2021). Nanoscale magnetic inhomogeneities in the triple A-site columnar ordered quadruple perovskites RMn3O6 (R = Y or Dy). Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-32-906
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