Evidence of discrete energy states and cluster-glass behavior in

A Kumar, B Schwarz, H Ehrenberg, RS Dhaka - Physical Review B, 2020 - APS
We report the detailed analysis of specific heat [CP (T)] and ac susceptibility for magnetically
frustrated Sr 2− x La x CoNbO 6 (x= 0–1) double perovskites to understand low-temperature …

Evolution of complex magnetic phases and metal-insulator transition through Nb substitution in

R Shukla, RS Dhaka - Physical Review B, 2023 - APS
We report the evolution of structural, magnetic, transport, and electronic properties of bulk
polycrystalline La 0.5 Sr 0.5 Co 1− x Nb x O 3 (x= 0.025–0.25) samples. The Rietveld …

Probing the electronic and local structure of using near-edge and extended x-ray absorption fine structures

A Kumar, R Shukla, R Kumar, RJ Choudhary, SN Jha… - Physical Review B, 2022 - APS
We report the electronic and local structural investigation of double pervoskites Sr 2− x La x
CoNbO 6 (x= 0− 1) using x-ray absorption near-edge structure (XANES) and extended x-ray …

Observation of Anisotropic Thermal Expansion and the Jahn–Teller Effect in Double Perovskites Sr2–xLaxCoNbO6 Using Neutron Diffraction

A Kumar, A Jain, SM Yusuf… - The Journal of Physical …, 2022 - ACS Publications
We use temperature dependent neutron powder diffraction (NPD) to investigate the
structural changes and magnetic interactions in double perovskite Sr2–x La x CoNbO6 (x …

Unraveling magnetic interactions and the spin state in insulating

A Kumar, RS Dhaka - Physical Review B, 2020 - APS
We investigate the structural, magnetic, and spin-state transitions, and magnetocaloric
properties of Sr 2− x La x CoNbO 6 (x= 0–1) double perovskites. The structural transition …

Correlation between the exchange bias effect and antisite disorder in

A Kumar, B Schwarz, RS Dhaka - Physical Review B, 2024 - APS
We unravel the effect of La substitution and hence antisite disorders on the exchange bias
(EB) mechanism in Sr 2− x La x CoNbO 6 (x= 0, 0.2) double-perovskite samples using the …

Na4Co3(PO4)2P2O7/NC Composite as a Negative Electrode for Sodium-Ion Batteries

PK Dwivedi, SK Sapra, J Pati… - ACS Applied Energy …, 2021 - ACS Publications
In recent years, the mixed phosphate-based polyanionic electrode materials have attracted
great attention in sodium-ion batteries (SIBs) due to their structural stability during cycling …

Dielectric behavior and impedance spectroscopy of Niobium substituted Lanthanum based orthovanadates at high temperatures

A Kumar, VN Thakur, A Kumar, V Singh, A Dhaka… - Ceramics …, 2024 - Elsevier
We present the detailed study of the temperature dependent dielectric properties,
impedance spectroscopy and electrical conductivity of LaV 1− x Nb x O 4 (x= 0–1) samples …

Structural, vibrational and electronic properties of Nb substituted orthovanadates LaV1− xNbxO4

A Kumar, A Sharma, M Sharma, V Singh… - Journal of Alloys and …, 2023 - Elsevier
We investigate the structural, vibrational, morphological, and electronic properties of Nb
substituted orthovanadate LaV 1− x Nb x O 4 samples prepared by the solid-state reaction …

High temperature dielectric and impedance spectroscopy study of LaCo0. 7Nb0. 3O3

VN Thakur, A Kumar, A Kaushik, GD Gupt… - Materials Research …, 2023 - Elsevier
We report the high temperature dielectric and ac impedance spectroscopy investigation of
Nb substituted LaCo 0.7 Nb 0.3 O 3 polycrystalline sample. The maximum dielectric constant …