Multiferroicity and magnetoelectric coupling in \alpha-CaCr2O4
Kiran Singh, Charles Simon, Pierre Toledano
TL;DR
This paper confirms ferroelectricity and magnetoelectric coupling in alpha-CaCr2O4 below 43K, revealing how magnetic and electric properties are intertwined and influenced by symmetry and external fields.
Contribution
It demonstrates ferroelectricity in alpha-CaCr2O4's magnetic phase and analyzes how symmetry and external electric fields affect its polarization and phase stability.
Findings
Ferroelectricity confirmed below 43K in alpha-CaCr2O4.
Magnetoelectric coupling proportional to magnetic field squared.
External electric field influences phase symmetry and polarization.
Abstract
Ferroelectricity in the incommensurate helical magnetic phase (below TN, 43K) of alpha CaCr2O4 has been confirmed by pyroelectric measurements. Magnetoelectric and magnetodielectric coupling exist below TN and are proportional to the square of magnetic field. From symmetry analysis, we suggest that the presence of an external electric field destabilizes the symmetrical 2221' phase and stabilizes 21' symmetry. This provides a unique system in which polarization varies as the fourth-degree of the order-parameter amplitude and exhibit a vanishingly small value below the first-order transition at TN, as observed experimentally.
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