828 citations · 1.7k across the 38 of their papers we have counts for
38 papers
Diverse Trends of Electron Correlation Effects for Properties with Different Radial and Angular Factors in an Atomic System: A case study in Ca
Pradeep Kumar, Cheng-Bin Li, B. K. Sahoo
Atomic properties such as field shift constants, magnetic dipole and electric quadrupole hyperfine structure constants, Landé factors, and electric quadrupole moments that ar…
Temperature Dependence of Nonlinear Susceptibilities in an Infinite Range Interaction Model
Pradeep Kumar, Christopher E. Wagner
We present a model to probe metamagnetic properties in systems with an arbitrary number of interacting spins. Thermodynamic properties such as the magnetization per particle $m(B,T…
Orbiton-Phonon coupling in Ir5+(5d4) double perovskite Ba2YIrO6
Birender Singh, G. A. Cansever, T. Dey +4
Ba2YIrO6, a Mott insulator, with four valence electrons in Ir5+ d-shell (5d4) is supposed to be non-magnetic, with Jeff = 0, within the atomic physics picture. However, recent sugg…
Finite frequency Seebeck coefficient of metals: A memory function approach
Pankaj Bhalla, Pradeep Kumar, Nabyendu Das +2
We study the dynamical thermoelectric transport in metals subjected to the electron-impurity and the electron-phonon interactions using the memory function formalism. We introduce…
Iron Isotope Effect in SmFeAsO0.65 and SmFeAsO0.77H0.12 Superconductors: A Raman Study
Birender Singh, P. M. Shirage, A. Iyo +1
We report the inelastic light scattering studies on SmFeAsO0.65 and SmFeAsO0.77H0.12 with iron isotopes namely 54Fe and 57Fe. In both of these systems under investigation we observ…
Theory of the Dynamical Thermal conductivity of Metals
Pankaj Bhalla, Pradeep Kumar, Nabyendu Das +2
The Mori's projection method, known as memory function method is an important theoretical formalism to study various transport coefficients. In the present work, we calculate the d…
Structural phase transition and material properties of few-layer monochalcogenides
Mehrshad Mehboudi, Benjamin M. Fregoso, Yurong Yang +6
GeSe and SnSe monochalcogenide monolayers and bilayers undergo a two-dimensional phase transition from a rectangular unit cell to a square unit cell at a temperature well bel…
The CeMIn5 (M = Rh, Ir and Co) System and the Single Energy Scale Model of Metamagnetism
A. Thamizhavel, B. D. White, M. B. Maple +5
For a decade and a half, CeCoIn and related alloys have served as a rich playground to explore the interplay between magnetism and unconventional superconductivity. Despite thi…
Two-dimensional disorder in black phosphorus and monochalcogenide monolayers
Mehrshad Mehboudi, Alex M. Dorio, Wenjuan Zhu +6
Ridged, orthorhombic two-dimensional atomic crystals with a bulk {\em Pnma} structure such as black phosphorus and monochalcogenide monolayers are an exciting and novel material pl…
Proximate transition temperatures amplify linear magnetoelectric coupling in strain-disordered multiferroic BiMnO3
Patrick R. Mickel, Hyoungjeen Jeen, Pradeep Kumar +2
We report a giant linear magnetoelectric coupling in strained BiMnO3 thin films in which the disorder associated with an islanded morphology gives rise to extrinsic relaxor ferroel…
Graphene Ripples as a Realization of a Two-Dimensional Ising Model: A Scanning Tunneling Microscope Study
J. K. Schoelz, P. Xu, V. Meunier +4
Ripples in pristine freestanding graphene naturally orient themselves in an array that is alternately curved-up and curved-down; maintaining an average height of zero. Using scanni…
Spectroscopic Studies of Iron-based Superconductors, Multi-ferroic Oxides and Double-perovskite: Phonons, Electronic and Spin Excitations
Pradeep Kumar
Raman spectroscopy is a very powerful probe to study the nature of quasi-particle excitations in condensed matter physics. The work presented in this thesis is focused on two diffe…
Phonon Anomalies, Orbital-Ordering and Electronic Raman Scattering in iron-pnictide Ca(Fe0.97Co0.03)2As2: Temperature-dependent Raman Study
Pradeep Kumar, D. V. S. Muthu, L. Harnagea +3
We report inelastic light scattering studies on Ca(Fe0.97Co0.03)2As2 in a wide spectral range of 120-5200 cm-1 from 5K to 300K, covering the tetragonal to orthorhombic structural t…
Metamagnetism and the Fifth Order Susceptibility in UPt3
B. S. Shivaram, Brian Dorsey, D. G. Hinks +1
An enhanced susceptibility is a natural consequence of the "heavy fermion" (HF) state rendering the possibility of measurably large nonlinear susceptibilities. In recent work a uni…
Temperature dependent magnetic, dielectric and Raman studies of partially disordered La2NiMnO6
Pradeep Kumar, S. Ghara, B. Rajeswaran +3
We report a detailed magnetic, dielectric and Raman studies on partially disordered and biphasic double perovskite La2NiMnO6. DC and AC magnetic susceptibility measurements show tw…
Raman evidence for coupling of superconducting quasi-particles with a phonon and crystal field excitation in superconductor Ce0.6Y0.4FeAsO0.8F0.2
Pradeep Kumar, D. V. S. Muthu, J. Prakash +2
We report inelastic light scattering experiments on superconductor Ce0.6Y0.4FeAsO0.8F0.2 from 4K to 300K covering the superconducting transition temperature Tc ~ 48.6K. A strong ev…
The Boson peak in supercooled water
Pradeep Kumar, K. Thor Wikfeldt, Daniel Schlesinger +2
We perform extensive molecular dynamics simulations of the TIP4P/2005 model of water to investigate the origin of the Boson peak reported in experiments on supercooled water in nan…
Pressure and temperature dependence of growth and morphology of Escherichia coli: Experiments and Stochastic Model
Pradeep Kumar, Albert Libchaber
We have investigated the growth of Escherichia coli E.coli, a mesophilic bacterium, as a function of pressure and temperature . E.coli can grow and divide in a wide range of…
Superconducting Fluctuations and Anomalous Phonon Renormalization much above superconducting transition temperature in Ca4Al2O5.7Fe2As2
Pradeep Kumar, A. Bera, D. V. S. Muthu +3
Raman studies on Ca4Al2O5.7Fe2As2 superconductor in the temperature range of 5 K to 300 K, covering the superconducting transition temperature Tc ~ 28.3 K, reveal that the Raman mo…
Coupled Phonons, Magnetic Excitations and Ferroelectricity in AlFeO3: Raman and First-principles Studies
Pradeep Kumar, A. Bera, D. V. S. Muthu +7
We determine the nature of coupled phonons and magnetic excitations in AlFeO3 using inelastic light scattering from 5 K to 315 K covering a spectral range from 100-2200 cm-1 and co…
Temperature-dependent Raman study of CeFeAsO0.9F0.1 Superconductor: Crystal field excitations, phonons and their coupling
Pradeep Kumar, Anil Kumar, Surajit Saha +5
We report temperature-dependent Raman spectra of CeFeAsO0.9F0.1 from 4 K to 300 K in spectral range of 60 to 1800 cm-1 and interpret them using estimates of phonon frequencies obta…
Raman Evidence for Superconducting Gap and Spin-Phonon Coupling in Superconductor Ca(Fe0.95Co0.05)2As2
Pradeep Kumar, Achintya Bera, D. V. S. Muthu +8
Inelastic light scattering studies on single crystal of electron-doped Ca(Fe0.95Co0.05)2As2 superconductor, covering the tetragonal to orthorhombic structural transition as well as…
Raman signatures of pressure induced electronic topological and structural transitions in Bi2Te3
Gopal K. Pradhan, Achintya Bera, Pradeep Kumar +2
We report Raman signatures of electronic topological transition (ETT) at 3.6 GPa and rhombohedral (α-Bi2Te3) to monoclinic (β-Bi2Te3) structural transition at ~ 8 GPa. At the onset…
Effect of pressure on the kinetics of bulge bases in small RNAs
Pradeep Kumar, J. Lehmann, A. Libchaber
Using molecular dynamics simulations, we study the effect of pressure on the binding propensity of small RNAs by calculating the free energy barrier corresponding to the looped out…