Quantum critical behavior of a magnetic quantum paraelectric

We discuss the interplay between anti-ferromagnetic order and polarization fluctuations in a magnetic quantum paraelectric. Using an action where anti-ferromagnetic order parameter couples to the polarization fluctuations and as well as magnetic field, we derive a set of self consistent equations to study both the temperature and the magnetic field dependence of the static dielectric susceptibility. The temperature dependence of dielectric susceptibility near both the anti-ferromagnetic quantum critical point and ferroelectric quantum critical point are described using scaling arguments. Discussions on achieving various quantum critical points in experiments are also made.

► Interplay between spin and polarization fluctuations has been studied in EuTiO3.
► Using a phenomenological action proposed with microscopic justifications.
► A set of self consistent equations derived to study static dielectric constant.
► Static quantum critical dielectric properties are described scaling arguments.
► Discussions on achieving various quantum critical points in experiments also made.