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Updated: Jan 23, 2026

Synthesis of Non-uniformly Pr-doped SrTiO3 Ceramics and Their Thermoelectric Properties
Published on: August 15, 2015
Destruction of multiferroicity in Tb2BaNiO5 by Sr-doping and its implication to magnetodielectric coupling
Sanjay K Upadhyay1, E V Sampathkumaran1
1Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400005, India.
Abstract:
The Haldane spin-chain compound, Tb2BaNiO5, with two antiferromagnetic transitions, one at T 1 = 63 K and the other at T 2 = 25 K, has been recently shown to be an exotic multiferroic below T 2. Here, we report the results of our investigation of Sr doping at the Ba site by magnetization, heat-capacity, magnetodielectric (MDE) and pyrocurrent measurements. An intriguing finding, which we stress, is that the ferroelectricity is lost even for a doping level of ten atomic percent, though magnetic ordering prevails. The doped specimens however retain significant MDE behaviour, but with reduced magnitudes and qualitative changes with respect to the behaviour of the parent compound. This implies that ferroelectric order is also crucial for the anomalously large MDE in the parent compound, in addition to the role of 4f single-ion anisotropy.
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