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Magneto-structural Coupling in Dipolar Glasses
Great chemical flexibility is afforded to the rare-earth simple perovskite manganites due to a variety of octahedra tilt patterns through which rigid MnO6 units coherently rotate to accommodate rare-earth cations of different ionic radii. To the contrary, in quadruple perovskites these tilts are strongly linked to the establishment of cation order, which offers far less flexibility in the bonding of under-sized rare-earth ions. We have recently shown that this rigidity leads to an unconventional structural phase transition that takes place at low temperature, which can be characterized by a static pattern of ordered atomic displacements as well as a dipolar-glass-like state. We are now working on the implications of the disordered dipolar-glass state with regards to long-range-ordered magnetism. R. D. Johnson et al., Physical Review B 99, 024107 (2018)
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