Showing papers by "Debnarayan Jana published in 2012"
TL;DR: In this article, a systematic study on the modification of optical properties in mechanically milled ZnO powder has been reported, where the average grain size of the powder becomes ∼20nm within 4h of milling.
32 citations
TL;DR: In this article, the thermodynamics of free Bose and Fermi gases for the entire range of temperature, and extended the same for harmonically trapped cases, were analyzed.
Abstract: We have analytically explored the thermodynamics of free Bose and Fermi gases for the entire range of temperature, and have extended the same for harmonically trapped cases. We have obtained approximate chemical potentials for the quantum gases in closed forms of temperature so that the thermodynamic properties of the quantum gases become plausible, especially in the intermediate regime between the classical and quantum limits.
13 citations
TL;DR: In this paper, the authors analytically explored thermodynamics of free Bose and Fermi gases for the entire range of temperature, and extended the same for harmonically trapped cases.
Abstract: We have analytically explored thermodynamics of free Bose and Fermi gases for the entire range of temperature, and have extended the same for harmonically trapped cases. We have obtained approximate chemical potentials of the quantum gases in closed forms of temperature so that the thermodynamic properties of the quantum gases become plausible specially in the intermediate regime between the classical and quantum limits.
12 citations
TL;DR: In this article, finite size and interparticle interaction corrections to the average energy of a harmonically trapped Fermi gas below and above the FermI temperature were explored, and a perturbative calculation within a mean field approximation was presented.
Abstract: We have analytically explored finite size and interparticle interaction corrections to the average energy of a harmonically trapped Fermi gas below and above the Fermi temperature, and have obtained a better fitting for the excess energy reported by DeMarco and Jin [Science 285, 1703 (1999)]. We have presented a perturbative calculation within a mean field approximation.
9 citations
TL;DR: In this paper, structural, spectroscopic and radiative emission characteristics of Eu-doped BaTiO3 (BT) nanosystem as compared to the pure BT system were reported.
Abstract: We report on the structural, spectroscopic and radiative emission characteristics of Eu-doped BaTiO3 (BT) nanosystem as compared to the pure BT system. The structural analysis was performed by X-ray diffraction (XRD) studies where the nanoscale BT sample exhibits a perovskite structure with most intense peak along (1 1 0) plane that depicts the preferred crystallographic orientation. Also, the diffraction peak intensity was found to be suppressed for Eu-doped BT nanosystem. The nature of radiative emission was evaluated via steady-state photoluminescence spectroscopy (PL) and positron annihilation spectroscopy (PAS). The improved radiative emission response, with Eu2+ doping, was believed to be accompanied by 4f65d→4f7 transitions in case of Eu-doped BT system. Whereas, PAS lifetime study of doped sample has revealed longer lifetimes indicating thereby partial substitution of Ti4+ by Eu2+ in BaTiO3 system.
7 citations
TL;DR: In this paper, a detailed scaling analysis of manganite systems with paramagnetic insulating and ferromagnetic metallic phases has been performed with the help of inelastic multi-step tunneling model and scaling concepts.
6 citations
Journal Article•
4 citations