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Photosensitive SrMnO3
Arup Kumar Mandal, Aprajita Joshi, Surajit Saha +8
In recent years, photosensitive materials have been in huge demand because of their fascinating ability to convert absorbed photon energy to generate strain and henceforth tuning t…
Low Thermal Conductivity and Interface Thermal Conductance in SnS2
Saheb Karak, Jayanta Bera, Suvodeep Paul +2
After the discovery of graphene, there have been tremendous efforts in exploring various layered two-dimensional (2D) materials for their potential applications in electronics, opt…
Spin-phonon coupling in Sr and Ti incorporated 9R-BaMnO3
Bommareddy Poojitha, Anjali Rathore, Surajit Saha
Materials having strong coupling between different degrees of freedom such as spin, lattice, orbital, and charge are of immense interest due to their potential device applications.…
Phonon Anomaly In 9R-Ba0.9Sr0.1MnO3
Bommareddy Poojitha, Surajit Saha
Materials which possess coupling between different degrees of freedom such as charge, spin, orbital and lattice are of tremendous interest due to their potential for device applica…
Signatures of Weak Spin-Phonon Coupling in 12R-BaTi0.4Mn0.6O3: A Raman Study
Bommareddy Poojitha, Anjali Rathore, Surajit Saha
Antiferromagnetic materials with strong spin-phonon coupling have the potential for spintronic applications. Here, we report the structural, magnetic, and vibrational properties of…
Engineering crystal structure and spin-phonon coupling in Ba1-xSrxMnO3
Bommareddy Poojitha, Ankit Kumar, Anjali Rathore +2
The interplay between different degrees of freedom such as charge, spin, orbital, and lattice has received a great deal of interest due to its potential to engineer materials prope…
Effect of phonon anharmonicity on ferroelectricity in EuxBa1-xTiO3
Bommareddy Poojitha, Km Rubi, Soumya Sarkar +3
Investigating the competition between ferroelectric ordering and quantum fluctuations is essential to tailor the desired functionalities of mixed ferroelectric and incipient ferroe…
Correlations between the structural, magnetic, and ferroelectric properties of BaMO3: M = Ti1-x(Mn/Fe)x compounds: A Raman study
Bommareddy Poojitha, Ankit Kumar, Anjali Rathore +1
Multiferroics possess two or more switchable states such as polarization, magnetization, etc. Phonon excitations in multiferroic phase are strongly modified by magnetoelectric coup…
Lattice dynamics across the ferroelastic phase transition in Ba2ZnTeO6: A Raman and first-principles study
Shalini Badola, Supratik Mukherjee, B. Ghosh +4
Structural phase transitions drive several unconventional phenomena including some illustrious ferroic attributes which are relevant for technological advancements. With this note,…
Electron-phonon and phonon-phonon anharmonic interactions in 2H-MoX2 (X=S, Te): A comprehensive Resonant Raman study
Suvodeep Paul, Saheb Karak, Annie Mathew +2
Transition metal dichalcogenides (TMDs) are layered materials which show excellent potential for nanoelectronic and optoelectronic applications. However, as many of the exciting fe…
Hexagonal Boron Nitride-Graphene Heterostructures with Enhanced Interfacial Thermal Conductance for Thermal Management Applications
Saheb Karak, Suvodeep Paul, Devesh Negi +4
Atomically thin monolayers of graphene show excellent electronic properties which have led to a great deal of research on their use in nanoscale devices. However, heat management o…
Signatures of magnetostriction and spin-phonon coupling in magnetoelectric hexagonal 15R-BaMnO3
Bommareddy Poojitha, Anjali Rathore, Ankit Kumar +1
Spin-phonon coupling, the interaction of spins with surrounding lattice is a key parameter to understand the underlying physics of multiferroics and engineer their magnetization dy…
d5-off-centering induced ferroelectric and magnetoelectric correlations in trirutile-Fe2TeO6
P. Pal, S. D. Kaushik, Shalini Badola +5
We present the rare existence of d5 off-centering, weak ferroelectric polarization and demonstrate its correlation with observed magnetoelectric (ME) properties in the G type (TN~2…
Unexpected Anisotropic Two Dimensional Electron Gas at the LaAlO3/SrTiO3 (110) Interface
A. Annadi, X. Wang, K. Gopinadhan +17
The observation of a two dimensional electron gas (2DEG) (1, 2), superconductivity (3, 4), magnetic effects (5) and electronic phase separation (6-8) at the interfaces of insulatin…
Temperature-Dependent Infrared Reflectivity Studies of Multiferroic TbMnO_{3}: Evidence for Spin-Phonon Coupling
Pradeep Kumar, Surajit Saha, C. R. Serrao +2
We have measured near normal incidence far infrared (FIR) reflectivity spectra of a single crystal of TbMnO3 from 10K to 300K in the spectral range of 50 cm to 700 cm…
Low temperature and high pressure Raman and x-ray studies of pyrochlore TbTiO : phonon anomalies and possible phase transition
Surajit Saha, D. V. S Muthu, Surjeet Singh +8
We have carried out temperature and pressure-dependent Raman and x-ray measurements on single crystals of TbTiO. We attribute the observed anomalous temperature depende…
Temperature dependent Raman and x-ray studies of spin-ice pyrochlore and non-magnetic pyrochlore
Surajit Saha, Surjeet Singh, B. Dkhil +5
We present here temperature-dependent Raman, x-ray diffraction and specific heat studies between room temperature and 12 K on single crystals of spin-ice pyrochlore compound $Dy_2T…
Manifestation of geometric frustration on magnetic and thermodynamic properties of pyrochlores (X=Ti, Zr)
Surjeet Singh, Surajit Saha, S. K. Dhar +3
We present here magnetization, specific heat and Raman studies on single-crystalline specimens of the first pyrochlore member of the rare-earth titanate series. Its a…
Electrochemically Top Gated Graphene: Monitoring Dopants by Raman Scattering
A. Das, S. Pisana, S. Piscanec +8
We demonstrate electrochemical top gating of graphene by using a solid polymer electrolyte. This allows to reach much higher electron and hole doping than standard back gating. In-…
Comparative High Pressure Raman Study of Boron Nitride Nanotubes and Hexagonal Boron Nitride
Surajit Saha, D. V. S. Muthu, D. Golberg +4
High pressure Raman experiments on Boron Nitride multi-walled nanotubes show that the intensity of the vibrational mode at ~ 1367 cm-1 vanishes at ~ 12 GPa and it does not recover…