Short-range magnetic correlation and magnetodielectric coupling in multiferroic Pb3TeMn3P2O14

TL;DR

This study investigates the structural, magnetic, and dielectric properties of Pb3TeMn3P2O14, revealing short-range magnetic correlations and magnetodielectric coupling around 100 K, with unique polarization behaviors at different temperatures and frequencies.

Contribution

It reports the discovery of magnetodielectric coupling and unusual polarization behavior in Pb3TeMn3P2O14, highlighting its potential for multiferroic applications.

Findings

Magnetodielectric coupling observed around 100 K.

Unusual polarization loop behaviors at room and liquid nitrogen temperatures.

Frequency-dependent transition in polarization and coercive field at around 15 Hz.

Abstract

In this paper the structural, magnetic, and dielectric properties of langasite compound Pb$_3$TeMn$_3$P$_2$O$_{14}$ have been investigated as a candidate of short-range magnetic correlations driven development of dielectric anomaly above N$\acute{e}$el temperature of ($T_N$=) 7 K. Presence of dielectric anomaly, structural phase transition and a short range magnetic correlation at the same temperature (at around 100 K) as well as magnetic field dependent capacitance clearly indicate that this compound shows magnetodielectric coupling at around 100 K. In addition, unusual behaviour is observed in two polarization loop at room temperature and liquid nitrogen temperature, where coercive field at liquid nitrogen temperature is larger than room temperature. Further, $P$-$E$ loop at liquid nitrogen temperature with different frequencies also affirm that the coercive field and remnant polarization are firstly reduced (but very small value) but when frequency is further increased to 15 Hz and 100 Hz, both of them are enhanced. Therefore, a transition is observed at around 15 Hz in frequency dependent $P_r$ and $E_C$ curve, which may be usually attributed to the generalized pinning and depinning of the dislocation arrays to polarization.