Concurrence of ferroelectric, dielectric and magnetic behaviour in Tb2Ti2O7 pyrochlore
B. Santhosh Kumar, Rajesh Narayana Perumal, C.Venkateswaran
TL;DR
This paper reports the discovery of ferroelectric behavior in Tb2Ti2O7 pyrochlore, showing coupled magnetic and dielectric anomalies around 380-383 K, linked to structural distortions.
Contribution
It provides the first evidence of ferroelectricity in Tb2Ti2O7 pyrochlore and links it to structural distortions in TiO6 octahedra.
Findings
Ferroelectric hysteresis observed below 382 K.
Dielectric anomaly at 383 K.
Magnetic deviation at 380 K supporting ferroelectricity.
Abstract
We report the ferroelectric property in Tb2Ti2O7 pyrochlore, prepared by a two-step solid-state reaction method. A concave P-E (polarisation vs electric field) loop observed from 382 K confirms ferroelectricity, below which the loop remains as pointed or banana-shaped. Dielectric plots clearly show an anomaly at 383 K and the magnetic data reveals a deviation from 380 K supporting the observed ferroelectric ordering. The origin of ferroelectricity in Tb2Ti2O7 is discussed which is due to the structural distortion in TiO6 octahedron.
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