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JOURNALS // Nanosystems: Physics, Chemistry, Mathematics // Archive

Nanosystems: Physics, Chemistry, Mathematics, 2023 Volume 14, Issue 2, Pages 208–215 (Mi nano1182)

PHYSICS

Symmetry-based prediction of the type-II multiferroics with pyrochlore structure

Valeriy M. Talanova, Mikhail V. Talanovab, Vladimir B. Shirokovabc

a Platov South-Russian State Polytechnic University, Novocherkassk, Russia
b Southern Federal University, Rostov-on-Don, Russia
c Southern Scientific Center of Russian Academy of Sciences, Rostov-on-Don, Russia

Abstract: Based on the symmetry related concept of the group theory we predict two structures with enantiomorphic space groups $P_I4_3$ and $P_I4_1$. These phases arise as a result of spin ordering on $16d$ Wyckoff position in crystals with space group $Fd\bar3m$. It is shown that $P_I4_3$ and $P_I4_1$ hypothetical magnetic structures are multiferroics of type II. The ferroelectric polarization emerges through a mechanism of the hybrid improper ferroelectricity allowing trilinear coupling of polarization and two other antiferromagnetic order parameters. In addition to improper ferroelectricity, the symmetry analysis proves the possible coexistence of other improper ferroic orders including orbital, ferroelastic, ferroelastoelectric, ferrobielastic, optical, ferroaxial, ferrotoroidic, gyrotropic and other crystal freedom degrees.

Keywords: spin order, multiferroics, improper ferroelectrics, trilinear coupling, multi-order state, secondary ferroics.

Received: 24.03.2023
Revised: 28.03.2023
Accepted: 29.03.2023

Language: English

DOI: 10.17586/2220-8054-2023-14-2-208-215



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© Steklov Math. Inst. of RAS, 2024