Destruction of multiferroicity in Tb2BaNiO5 by Sr-doping and its implication to magnetodielectric coupling

The Haldane spin-chain compound, Tb2BaNiO5, with two antiferromagnetic transitions, one at T1  =  63 K and the other at T2  =  25 K, has been recently shown to be an exotic multiferroic below T2. Here, we report the results of our investigation of Sr doping at the Ba site by magnetization, heat-capa...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2019-10, Vol.31 (39), p.39LT01-39LT01
Main Authors: Upadhyay, Sanjay K, Sampathkumaran, E V
Format: Article
Language:English
Subjects:
BaNiO
magnetodielectric coupling
multiferroics
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Summary:The Haldane spin-chain compound, Tb2BaNiO5, with two antiferromagnetic transitions, one at T1  =  63 K and the other at T2  =  25 K, has been recently shown to be an exotic multiferroic below T2. 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.
ISSN:0953-8984
1361-648X
DOI:10.1088/1361-648X/ab2d0f