SrTiO 3 belongs to the class of incipient ferroelectrics in which an electrically ordered state is
suppressed by quantum fluctuations. To investigate the nature of these excitations, we have …

We carry out first-principles density-functional calculations of the antiferrodistortive (AFD)
and ferroelectric (FE) soft-mode instabilities in tetragonal SrTiO 3, with the structural degrees …

The structure of the antiphase domain boundaries of strontium titanate SrTiO 3 that exist at
temperatures below the antiferrodistortive transition, is analyzed. It is found that some …

To clarify the inconsistencies in existing elastic constant data of SrTiO 3 in the vicinity of the
105 K phase transition we have studied the temperature dependence of the Young's …

A high, rounded peak of the permittivity, ɛ max′≈ 6× 10 4, at T≈ 18 K evidence a
percolative-type phase transition into a random-field-induced ferroelectric domain state of …

Nominally pure has been studied by dielectric spectroscopy using small (linear regime) as
well as large electrical fields (non-linear regime) up to. In addition measurements of the …

Charge transport in doped quantum paraelectrics (QPs) presents a number of puzzles,
including a pronounced T 2 regime in the resistivity. We analyze charge transport in a QP …

The transition between the cubic and tetragonal phase in shows an excess specific heat of.
Comparison between the temperature evolution of the excess entropy and the structural …

We develop a theory of superconducting pairing in low-density strontium titanate due to the
quadratic coupling of electron density to soft transverse optical phonons first proposed by …

Spatial correlations between atoms can generate a depletion in the energy dispersion of
acoustic phonons. Two well-known examples are rotons in superfluid helium and the Kohn …