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.
The paper reviews applications of rotational anisotropy second harmonic generation to identify crystallographic, magnetic, and hidden order parameters across condensed matter systems.
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Orbital inversion and emergent lattice dynamics in infinite layer CaCoO$_2$
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.