Multiferroicity and para/ferroelectric transition in GeV4S8.
In the last years multiferroic compounds have attracted a lot
of attention due to their coupled magnetic and electric properties.
Indeed, when large, such a coupling allows the cross control of
the magnetic field and of the polarization or dielectric constant
through the application of a magnetic field. These systems also
exhibit intrinsic lattice degrees of freedom leading to lattice
instabilities and/or structural phase transitions.
In this seminar I will report about the discovery of the multiferroicity
in GeV4S8 compound and on the physical interpretation of
paraelectric/ferroelectric transition occuring at 32 K [1,2].
 E. Cannuccia et al. J. Phys. Chem. C, 121, 3522 (2017)
 K.Singh, et al. Phys. Rev. Lett. 113, 137602 (2014)