32 citations · 148 across the 16 of their papers we have counts for
16 papers
Origin of destruction of multiferroicity in Tb2BaNiO5 by Sr doping and its implications
Ram Kumar, S. Rajput, T. Maitra +6
The orthorhombic Haldane spin chain compound Tb2BaNiO5 (Neel order, TN1= 63 K) has been shown to be an exotic multiferroic system below (TN2) 25 K due to various fascinating featur…
Destruction of multiferroicity in Tb2BaNiO5 by Sr doping and its implication to magnetoelectric coupling
Sanjay K Upadhyay, E. V. Sampathkumaran
The Haldane spin-chain compound, Tb2BaNiO5, with two antiferromagnetic transitions, one at T1=63K, and the other at T2=25K, has been recently shown by us to be an exotic multiferro…
Existence of a critical canting angle of magnetic moments to induce multiferroicity in the Haldane spin-chain system, Tb2BaNiO5
Ram Kumar, Sudhindra Rayaprol, Sarita Rajput +5
We report an unusual canted magnetism due to 3d and 4f electrons, occupying two different crystallographic sites, with its consequence to electric dipole order. This is based on ne…
Neutron diffraction study of a metallic kagome lattice, Tb3Ru4Al12
Sudhindra Rayaprol, Andreas Hoser, Kartik K Iyer +2
We present the results of neutron diffraction studies on polycrystals of a metallic kagome lattice, Tb3Ru4Al12, reported recently to undergo reentrant magnetism, with the onset of…
Anisotropic re-entrant spin-glass features in a metallic kagome lattice, Tb3Ru4Al12
E. V. Sampathkumaran, Kartik K Iyer, Sanjay K Upadhyay +1
We report the results of ac and dc magnetic susceptibility and isothermal magnetization measurements (T= 2-300 K) on the single crystals of a metallic kagome lattice, Tb3Ru4Al12, r…
Multiferroicity in a spin-chain compound, Tb2BaCoO5, with exceptionally large magnetodielectric coupling in polycrystalline form
Sanjay K Upadhyay, E. V. Sampathkumaran
We report the results of detailed investigations of magnetization, heat-capacity, dielectric, pyrocurrent, and magneto(di)electric measurements on Tb2BaCoO5, belonging to a hither-…
Dielectric and multiferroic behavior in a Haldane spin-chain compound Sm2BaNiO5 due to an interplay between crystal-field effect and exchange interaction
Sanjay Kumar Upadhyay, Kartik K Iyer, E. V. Sampathkumaran
The Haldane spin-chain (S=1) insulating compound, Sm2BaNiO5, which has been proposed to order antiferromagnetically around (T_N=) 55 K, was investigated for its complex dielectric…
Magnetic behavior of new compounds, Gd3RuSn6 and Tb3RuSn6
Sanjay K Upadhyay, Kartik K Iyer, E. V. Sampathkumaran
We report temperature (T) dependence of dc magnetization, electrical resistivity (rho(T)), and heat-capacity of rare-earth (R) compounds, Gd3RuSn6 and Tb3RuSn6, which are found to…
Magnetic behavior of metallic kagome lattices, Tb3Ru4Al12 and Er3Ru4Al12
Sanjay Kumar Upadhyay, Kartik K Iyer, E. V. Sampathkumaran
We report magnetic behavior of two intermetallics-based kagome lattices, Tb3Ru4Al12 and Er3Ru4Al12, crystallizing in the Gd3Ru4Al12-type hexagonal crystal structure, by measurement…
Extraordinarily large intrinsic magnetodielectric coupling of Tb member within the Haldane spin-chain family, R2BaNiO5
Sanjay Kumar Upadhyay, P. L. Paulose, E. V. Sampathkumaran
The Haldane spin-chain compound, Tb2BaNiO5, has been known to order antiferromagnetically below (T_N= ) 63 K. The present magnetic studies on the polycrystals bring out that there…
Re-entrant spin-glass freezing and magneto-dielectric behavior of Li3NiRuO6, a layered rock-salt related oxide
Sanjay Kumar Upadhyay, Kartik K Iyer, S. Rayaprol +2
We report the results of neutron diffraction, ac and dc magnetization, heat-capacity, complex permittivity, and pyrocurrent measurements on an oxide, Li3NiRuO5, hitherto not paid m…
Relaxor ferroelectric behavior and intrinsic magnetodielectric behavior near room temperature in Li2Ni2Mo3O12, a compound with distorted honeycomb and spin-chains
Sanjay Kumar Upadhyay, Kartik K Iyer, Shankar Ghosh +2
Keeping current interests to identify materials with intrinsic magnetodielectric behavior near room temperature and with novel pyroelectric current anomalies, we report temperature…
Study of Electro-Caloric Effect in Ca and Sn co-Doped BaTiO3 Ceramics
Sanjay Kumar Upadhyay, Iram Fatima, V. Raghavendra Reddy
The present work deals with the study of structural, ferroelectric, dielectric and electro-caloric effects in lead free ferroelectric polycrystalline Ba1-xCaxTi0.95Sn0.05O3 (x= 2,…
Evolution of magnetic and dielectric properties in Sr-substituted high temperature multiferroic YBaCuFeO5
Surender lal, Sanjay K. Upadhyay, K. Mukherjee +1
We report the evolution of structural, magnetic and dielectric properties due to partial substitution of Ba by Sr in the high temperature multiferroic YBaCuFeO5. This compound exhi…
Spin-glass behavior and pyroelectric anomalies in a new lithium-based oxide, Li3FeRuO5
Sanjay Kumar Upadhyay, P. L. Paulose, Kartik K Iyer +1
The results of dc and ac magnetization, heat-capacity, 57Fe Moessbauer spectroscopy, dielectric, pyroelectric current and isothermal magneto-capacitance measurements on a recently…
A rock-salt type Li-based oxide, Li3Ni2RuO6, exhibiting a chaotic ferrimagnetism with cluster spin-glass dynamics and thermally frozen charge carriers
Sanjay Kumar Upadhyay, Kartik K Iyer, S. Rayaprol +2
The area of research to discover new Li containing materials and to understand their physical properties has been of constant interest due to applications potential for rechargeabl…