98 citations · 605 across the 23 of their papers we have counts for
23 papers
Bouncing cosmological models in a functional form of F(R) gravity
A. S. Agrawal, S. Mishra, S. K. Tripathy +1
We have investigated some bouncing cosmological models in an isotropic and homogeneous space time with the F(R) theory of gravity. Two functional forms of F(R) have been investigat…
Element-specific probe of quantum criticality in
A. Khansili, R. Sharma, R. Hissariya +11
Employing the elemental sensitivity of x-ray absorption spectroscopy (XAS) and x-ray magnetic circular dichroism (XMCD), we study the valence and magnetic order in the heavy fermio…
Anharmonic Phonons and Anomalous Thermal Expansion of Graphite
Ranjan Mittal, Mayanak K. Gupta, Baltej Singh +2
We have investigated the anisotropic thermal expansion of graphite using ab-initio calculation of lattice dynamics and anharmonicity of the phonons, which reveal that the negative…
Textured heterogeneity in square artificial spin ice
J. C. T Lee, S. K. Mishra, V. S. Bhat +8
We report evidence of spontaneous formation of a heterogeneous network of superdomains in two-dimensional square artificial spin ice nanostructures in externally applied magnetic f…
Raman studies on nanocomposite silicon carbonitride thin film deposited by RF magnetron sputtering at different substrate temperatures
A. S. Bhattacharyya, S. K. Mishra
Raman studies of nanocomposite SiCN thin film by sputtering showed that with an increase of substrate temperature from room temperature to 500oC, a transition from mostly sp2 graph…
Magnetically Charged Superdomain Walls In Square Artificial Spin Ice
J. C. T Lee, S. K. Mishra, V. S. Bhat +8
We report direct evidence that magnetically charged superdomain walls form spontaneously in two dimensional square artificial spin ice nanostructures in response to external magnet…
Synthesizing Skyrmion Molecules in Fe-Gd Thin Films
J. C. T Lee, J. J. Chess, S. A. Montoya +9
We show that properly engineered amorphous Fe-Gd alloy thin films with perpendicular magnetic anisotropy exhibit room-temperature skyrmion molecules, or a pair of like-polarity, op…
Spin-Phonon Coupling and High Pressure Phase Transitions of RMnO3 (R= Ca and Pr): An Inelastic Neutron Scattering and First Principle Studies
S. K. Mishra, M. K. Gupta, R. Mittal +2
We report inelastic neutron scattering measurements over 7-1251 K in CaMnO3 covering various phase transitions, and over 6-150 K in PrMnO3 covering the magnetic transition. The exc…
High Temperature Phase Stability in Li0.12Na0.88NbO3: A Combined powder X-Ray and Neutron Diffraction Study
S. K. Mishra, P. S. R. Krishna, A. B. Shinde +4
Lithium doped sodium niobate is an ecofriendly piezoelectric material that exhibits a variety of structural phase transitions with composition and temperature. We have investigated…
Three-level spin system under decoherence-minimizing driving fields: Application to nitrogen-vacancy spin dynamics
Sunil K. Mishra, L. Chotorlishvili, A. R. P. Rau +1
Within the framework of a general three-level problem, the dynamics of the nitrogen-vacancy (NV) spin is studied for the case of a special type of external driving consisting of a…
Ground state of (Pb0.94Sr0.06)(Zr0.530Ti0.470)O3 in the morphotropic phase boundary region: Evidence for a monoclinic Cc space group
Ravindra Singh Solanki, Akhilesh Kumar Singh, S. K. Mishra +5
The antiferrodistortive (AFD) phase transition for a pseudotetragonal composition of Pb(Zr0.530Ti0.470)O3 (PZT) doped with 6% Sr has been investigated using sound velocity (4 to 32…
Antiferrodistortive Phase Transition in Pseudorhombohedral (Pb0.94Sr0.06)(Zr0.550Ti0.450)O3 : A Combined Synchrotron x-ray and Neutron Powder Diffraction Study
Ravindra Singh Solanki, S. K. Mishra, Anatoliy Senyshyn +5
The controversies about the structure of the true ground state of pseudorhombohedral compositions of Pb(ZrxTi1-x)O3 (PZT) are addressed using a 6% Sr2+ substituted sample with x=0.…
Evidence for a tricritical point coinciding with the triple point in (Pb0.94Sr0.06)(ZrxTi1-x)O3 : A combined synchrotron x-ray diffraction, dielectric and Landau theory study
Ravindra Singh Solanki, S. K. Mishra, Yoshihiro Kuroiwa +2
We present here results of high resolution synchrotron x-ray diffraction (SXRD) and dielectric studies in conjunction with Landau theory considerations on (Pb0.94Sr0.06)(ZrxTi1-x)O…
Coupled skyrmion sublattices in Cu2OSeO3
M. C. Langner, S. Roy, S. K. Mishra +8
We report the observation of the skyrmion lattice in the chiral multiferroic insulator Cu2OSeO3 using Cu L3-edge resonant soft x-ray diffraction. We observe the unexpected existenc…
Phonon Dynamics and Inelastic Neutron Scattering of Sodium Niobate
S. K. Mishra, M. K. Gupta, R. Mittal +4
Sodium niobate (NaNbO3) exhibits most complex sequence of structural phase transitions in perovskite family and therefore provides as excellent model system for understanding the m…
Helical multiferroics for electric field controlled quantum information processing
M. Azimi, L. Chotorlishvili, S. K. Mishra +3
Magnetoelectric coupling in helical multiferroics allows to steer spin order with electric fields. Here we show theoretically that in a helical multiferroic chain quantum informati…
Appreciable magnetic moment and energy density in single step normal route synthesized MnBi
Nithya R. Christopher, Nidhi Singh, Shiva Kumar Singh +4
We study the structural and magnetic properties of the MnBi inter-metallic compound. The LTP (Low Temperature Phase) MnBi compound is successfully synthesized in single step by vac…
Evidence for anomalous structural behavior in CaFe2As2
S. K. Mishra, R. Mittal, P. S. R. Krishna +5
The structural properties of the CaFe2As2 have been investigated by x-ray and neutron powder diffraction techniques as a function of temperature. Unambiguous experimental evidence…
Phase Stability of Multiferroic GaFeO3 up to 1368 K from In situ Neutron Diffraction
S. K. Mishra, R. Mittal, R. Singh +3
We report a detailed high-temperature powder neutron diffraction investigation of the structural behavior of the multiferroic GaFeO3 between 296 and 1368 K. Temperature dependent n…
Synchrotron X-ray Diffraction Study of BaFe2As2 and CaFe2As2 at High Pressures up to 56 GPa: Ambient and Low-Temperatures Down to 33 K
R. Mittal, S. K. Mishra, S. L. Chaplot +9
We report high pressure powder synchrotron x-ray diffraction studies on MFe2As2 (M=Ba, Ca) over a range of temperatures and pressures up to about 56 GPa using a membrane diamond an…
Origin of Large Dielectric Constant with Large Remnant Polarization and Evidence of Magnetoelectric Coupling in Multiferroic La modified BiFeO3-PbTiO3 Solid Solution
Anupinder Singh, Ratnamala Chatterjee, S. K. Mishra +2
The presence of superlattice reflections and detailed analyses of the powder neutron and x-ray diffraction data reveal that La rich (BF-LF)-(PT)…
Dual Behavior of Antiferromagnetic Uncompensated Spins in NiFe/IrMn Exchange Biased Bilayers
S. K. Mishra, F. Radu, S. Valencia +4
We present a comprehensive study of the exchange bias effect in a model system. Through numerical analysis of the exchange bias and coercive fields as a function of the antiferroma…
Origin of the reduced exchange bias in epitaxial FeNi(111)/CoO(111) bilayer
F. Radu, S. K. Mishra, I. Zizak +12
We have employed Soft and Hard X-ray Resonant Magnetic Scattering and Polarised Neutron Diffraction to study the magnetic interface and the bulk antiferromagnetic domain state of t…