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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…
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…
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…
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…
Raman evidence for Orbiton-Mediated Multiphonon Scattering in Multiferroic TbMnO
Pradeep Kumar, Surajit Saha, D. V. S. Muthu +3
Temperature-dependent Raman spectra of TbMnO from 5 K to 300 K in the spectral range of 200 to 1525 cm show five first-order Raman allowed modes and two high frequency m…