Under modest tensile strain, SrTiO3 develops a polar vibrational mode at finite wavevector, indicating a textured polar phase on nanometer scales rather than uniform ferroelectric order.
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XAS and RIXS measurements on CaCoO2 show Ca 4s-Co 3d hybridization inverting square-planar orbital occupation plus a momentum-dependent low-energy mode suggestive of electronic/orbital ordering.
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A textured polar phase in strained SrTiO3
Under modest tensile strain, SrTiO3 develops a polar vibrational mode at finite wavevector, indicating a textured polar phase on nanometer scales rather than uniform ferroelectric order.