Dmitry D. Khalyavin

Giant improper ferroelectricity in the ferroaxial magnet CaMn7O12.

In rhombohedral

A ferroelectric-like structural transition in a metal

{\mathrm{CaMn}}_{7}{\mathrm{O}}_{12}

Magnetically driven suppression of nematic order in an iron-based superconductor

, an improper ferroelectric polarization of magnitude

Ammonia-rich high-temperature superconducting intercalates of iron selenide revealed through time-resolved in situ X-ray and neutron diffraction.

2870\text{ }\text{ }\ensuremath{\mu}\mathrm{C}\text{ }{\mathrm{m}}^{\ensuremath{-}2}

Spin-ordering and magnetoelastic coupling in the extended kagome system YBaCo4O7

is induced by an incommensurate helical magnetic structure that evolves below

Sc2NiMnO6: A Double-Perovskite with a Magnetodielectric Response Driven by Multiple Magnetic Orders.

{T}_{\mathrm{N}1}=90\text{ }\text{ }\mathrm{K}

Polar and antipolar polymorphs of metastable perovskiteBiFe0.5Sc0.5O3

. The electric polarization was found to be constrained to the high symmetry threefold rotation axis of the crystal structure, perpendicular to the in-plane rotation of the magnetic moments. The multiferroicity is explained by the ferroaxial coupling mechanism, which in

Symmetry of reentrant tetragonal phase in Ba 1 − x Na x Fe 2 As 2 : Magnetic versus orbital ordering mechanism

{\mathrm{CaMn}}_{7}{\mathrm{O}}_{12}

Magnetoelastic coupling in the phase diagram of Ba1-xK xFe2As2 as seen via neutron diffraction

gives rise to the largest magnetically induced, electric polarization measured to date.

Complex room-temperature ferrimagnetism induced by zigzag stripes of oxygen vacancies inSr3YCo4O10+δ

Metals cannot exhibit ferroelectricity because static internal electric fields are screened by conduction electrons, but in 1965, Anderson and Blount predicted the possibility of a ferroelectric metal, in which a ferroelectric-like structural transition occurs in the metallic state. Up to now, no clear example of such a material has been identified. Here we report on a centrosymmetric (R3c) to non-centrosymmetric (R3c) transition in metallic LiOsO3 that is structurally equivalent to the ferroelectric transition of LiNbO3 (ref. 3). The transition involves a continuous shift in the mean position of Li(+) ions on cooling below 140 K. Its discovery realizes the scenario described in ref. 2, and establishes a new class of materials whose properties may differ from those of normal metals.