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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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.
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Symmetry-Resolved Second Harmonic Generation in Quantum and Functional Materials
The paper reviews applications of rotational anisotropy second harmonic generation to identify crystallographic, magnetic, and hidden order parameters across condensed matter systems.