A5022957066- Multiferroics and related materials
- Advanced Condensed Matter Physics
- Magnetic and transport properties of perovskites and related materials
- Nuclear materials and radiation effects
- Ferroelectric and Piezoelectric Materials
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Magneto-Optical Properties and Applications
- Thermal Expansion and Ionic Conductivity
- Rare-earth and actinide compounds
- Dielectric properties of ceramics
- Glass properties and applications
- Theoretical and Computational Physics
- Teratomas and Epidermoid Cysts
- ZnO doping and properties
- Inorganic Chemistry and Materials
- Advanced Sensor and Energy Harvesting Materials
- Chalcogenide Semiconductor Thin Films
- Magnetic Properties of Alloys
- Microwave Dielectric Ceramics Synthesis
- High-pressure geophysics and materials
- Heusler alloys: electronic and magnetic properties
- Iron-based superconductors research
- Smart Materials for Construction
- Physics of Superconductivity and Magnetism
National Sun Yat-sen University
2022-2024
Indian Association for the Cultivation of Science
2024
University of Groningen
2024
Indian Institute of Technology BHU
2018-2023
Banaras Hindu University
2016-2023
Indian Institute of Technology Madras
2019-2022
S.N. Bose National Centre for Basic Sciences
2019
Homi Bhabha National Institute
2019
Interaction Institute for Social Change
2019
Bhabha Atomic Research Centre
2019
We report the comprehensive experimental results identifying magnetic spin ordering and magnetization dynamics of a double perovskite Pr2CoFeO6 by employing (dc ac) magnetization, powder neutron diffraction (NPD) X-ray circular dichroism (XMCD) techniques. studies revealed that adopts B-site disordered orthorhombic structure with space group Pnma. Additionally, ab initio band calculations performed on this system suggested an insulating anti-ferromagnetic (Fe-Fe) ground state. Magnetometry...
Electronic structure of Pr2CoFeO6 (at 300 K) was investigated by x-ray photoemission spectroscopy (XPS) and absorption techniques. All three cations, i.e. Pr, Co Fe were found to be trivalent in nature. XPS valance band analysis suggested the system insulating The that Co3+ ions exist low spin state system. Moreover, Raman study indicated random distribution B-site (Co/Fe) triggered same charge states. In temperature-dependent study, relative heights two observed phonon modes exhibited...
A two-dimensional honeycomb-structured magnet ${\mathrm{Ni}}_{2}{\mathrm{Te}}_{3}{\mathrm{O}}_{8}$ was synthesized, characterized, and comprehensively investigated for its intriguing physical properties. DC magnetization, specific heat, neutron diffraction revealed a long-range commensurate antiferromagnetic ordering at ${T}_{\mathrm{N}}\ensuremath{\sim}35\phantom{\rule{0.16em}{0ex}}\mathrm{K}$ with propagation vector $\mathbf{k}=(100)$. The magnetic sublattice comprises stacking distorted...
Abstract Antiferromagnetic (AFM) materials with a colossal exchange bias (EB) effect find applications as high-density spintronic devices. We report structural (geometrical and electronic) magnetic studies in the polycrystalline Pr 2 CoFe 0.5 Mn O 6 double perovskite system. The observed lack of training suggests existence robust EB. In addition, detailed Raman unravel Griffith-like phase along spin-phonon coupling present x-ray photoemission spectroscopy (XPS) analysis supports more than...
Electronic structure, electrical transport, dc and ac magnetization properties of the hole substituted (Sr2+) partially B-site disordered double perovskite Pr2-xSrxCoMnO6 system have been investigated. structure was probed by employing X-ray photoemission spectroscopy (XPS) measurements. The study suggested presence mixed valence states ions (Co2+/Co3+ Mn3+/Mn4+) with significant enhancement average oxidation due to doping. mere absence electronic near Fermi level in band (VB) spectra for...
Spin-frustrated systems are well known for exhibiting fascinating and exotic magnetic properties often intertwined with other intriguing phenomena. Magnetization specific-heat studies suggest that the spin-frustrated chiral triangular lattice compound ${\mathrm{MnGeTeO}}_{6}$ undergoes a long-range antiferromagnetic transition below N\'eel temperature $({T}_{\mathrm{N}})$ \ensuremath{\sim} 9 K, which is further validated in neutron powder-diffraction (NPD) study. In absence of an external...
Some novel magnetic behaviours in double perovskite Eu2CoMnO6 (ECMO) have been reported. The x-ray photoemission spectroscopy study shows the presence of mixed valence states transition metal ions. UV–visible absorption spectroscopic suggests that ECMO has a direct wide band gap. A second-order phase as sudden jump magnetization curve observed around 124.5 K. large bifurcation between zero field cooling and cooling, existence strong spin frustration system. inverse DC susceptibility confirms...
Helical magnets are extremely promising, as they have fascinating magnetic, electric, and phononic properties. Here, we report a spectrum of simultaneously occurring highly entangled intriguing phenomena induced by helical spin ordering in noncentrosymmetric spin-frustrated system ${\mathrm{Fe}}_{3}(\mathrm{P}{\mathrm{O}}_{4}){\mathrm{O}}_{3}$. These include magnetodielectric effect the form frequency-independent pronounced dielectric peak, clear magnetostriction manifested dramatic downturn...
The physical properties of the noncentrosymmetric and quasi-two-dimensional canted antiferromagnetic material ${\mathrm{CoTeMoO}}_{6}$ (CTMO) are studied. We unravel a spectrum intriguing phenomena, including correlated short-range-ordered Griffiths-like phase near ${T}_{G}\ensuremath{\sim}64\phantom{\rule{0.16em}{0ex}}\mathrm{K}$, sharp step-like metamagnetic behavior isothermal magnetization induced by spin-flop transition at critical magnetic field...
${\mathrm{Fe}}_{2}{({\mathrm{MoO}}_{4})}_{3}$ was synthesized and characterized as a prototype of L-type ferrimagnets (L-FiM) with an ordering temperature ${T}_{\mathrm{N}1}\ensuremath{\sim}12\phantom{\rule{0.28em}{0ex}}\mathrm{K}$ using magnetic susceptibility $(\ensuremath{\chi})$, specific heat $({C}_{\mathrm{p}})$, dielectric $({\ensuremath{\varepsilon}}^{\ensuremath{'}})$ anomaly. Two remarkable findings are field $(H)$ induced (i) additional phase transition at ${T}_{\mathrm{N}2}$...
Spin-chain compounds are known to exhibit fascinating magnetic properties, which mostly display ordering at very low temperatures or remain dynamic even 0 K. In contrast, the present quasi-one-dimensional spin-chain system $\mathrm{Ba}{\mathrm{Mn}}_{2}{\mathrm{V}}_{2}{\mathrm{O}}_{8}$ exhibits a collinear antiferromagnetic (AFM) long-range relatively higher temperature ${T}_{\mathrm{N}}\ensuremath{\sim}37\phantom{\rule{0.16em}{0ex}}\mathrm{K}$, wherein nearest-neighbor spins have AFM...
Complex systems with strongly entangled microscopic degrees of freedom often host a plethora exotic properties. Herein, we report the unconventional and interesting multiferroic behavior layered noncentrosymmetric ferrimagnetic spin-1/2 system, ${\mathrm{Bi}}_{2}{\mathrm{Cu}}_{5}{\mathrm{B}}_{4}{\mathrm{O}}_{14}$. Neutron powder-diffraction study deciphers robust ($\ensuremath{\uparrow}\ensuremath{\downarrow}\ensuremath{\downarrow}\ensuremath{\downarrow}\ensuremath{\downarrow}$) ordering...
Abstract The linear magnetoelectric (ME) characteristics of a quasi‐1D spin‐chain compound, FePbBiO 4 , are reported. Two distinct antiferromagnetic (AFM) orders occurring at ≈23 K ( T N1 ) and 12 N2 verified using magnetization, specific heat, conspicuous dielectric ε ′) anomalies. A striking observation is that no pyrocurrent I py detected in the absence magnetic field H ); however, ‐induced ferroelectric polarization P unexpectedly partially switches or reverses below as reproduced by...
The double perovskite compound Tb2CoMnO6has been investigated using x-ray absorption spectroscopy (XAS), Raman spectroscopy, magnetic measurements andab initioband structure calculations. It is observed that both anti-ferromagnetic (AFM) and ferromagnetic (FM) phase coexist in this material. presence of anti-site disorder (ASD) has established from the analysis neutron diffraction data. Moreover, a prominent metamagnetic transition theM(H) behavior explained with drastic reorientation pinned...
Double-perovskite-based magnets wherein frustration and competition between emergent degrees of freedom are at play can lead to novel electronic magnetic phenomena. In this paper, we report the structure properties an ordered double perovskite material, ${\mathrm{Ho}}_{2}{\mathrm{CoMnO}}_{6}$. perovskites with general class ${A}_{2}BB{}^{\ensuremath{'}}{\mathrm{O}}_{6}$ ($A$ = rare-earth ions; $B$, $B{}^{\ensuremath{'}}$ transition metal ions), octahedral $B$ sites have a distinct...
The magnetic property of a 0.7BiFeO3-0.3TbMnO3 composite has been studied in detail and compared with that 0.8BiFeO3-0.2TbMnO3. properties are improved manifold to BiFeO3. An exchange bias (HEB) is observed both the compositions these antiferromagnetic composites, which varies between 5 180 Oe maximum at ∼275 K. Isothermal remanent magnetization measurements room temperature indicate presence an interfacial layer 2-dimensional dilute uniaxial antiferromagnet uniform field (2D DAFF). can be...
A high-quality ${\mathrm{NiTe}}_{2}{\mathrm{O}}_{5}$ single crystal was grown via the flux method and characterized using synchrotron x-ray diffraction (XRD) electron probe microscopy techniques. The dc magnetization $(M)$ confirms antiferromagnetic long-range ordering temperature $({T}_{\mathrm{N}})$ at 28.5 K. An apparent domelike dielectric anomaly near ${T}_{\mathrm{N}}$, with scaling of magnetodielectric (MD) coupling $(\mathrm{MD}%\ensuremath{\propto}{M}^{2})$, signifies higher-order...