Extensive neutron inelastic scattering measurements of the frequencies of normal modes in strontium titanate propagating in the crystallographic directions (0, 0, zeta ), ( zeta , zeta , 0), ( zeta , zeta , zeta ), ( 1 / 2 , 1 / 2 , zeta ) and ( zeta , zeta , 1 / 2 ) are reported. The temperature de...
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