Physics

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Shiv Nadar University

We propose a model to explain the experimentally observed ion-beam mixing rates in reactive systems under nonoverlapping spike conditions. There are several technologically important metal-semiconductor systems belonging to this class. For comparison with model prediction, we have studied experimentally ion-beam mixing in Cu/Ge bilayer systems at various temperatures. The results show that the room-temperature mixing rate varies linearly with deposited energy density (Formula presented) and that the mixing is a diffusion controlled process proceeding via compound formation. Excellent agreement has been obtained between the experimental observations and theoretical values predicted from our proposed model while other current models are seen to be inadequate. The model also explains the mixing rates of the Ni/Si system reported in the literature. © 1996 The American Physical Society.

(SoNS) School of Natural Sciences

World University root node

Physical Review B - Condensed Matter and Materials Physics

Compound formation under local thermal spikes during ion-beam mixing: Model and its experimental verification

We explore the possibility of deforming Gell-Mann-Okubo (GMO) mass formula within the framework of a quantized enveloping algebra. A small value of the deformation parameter is found to provide a good fit to the observed mass spectra of the π, K and η mesons.

Pramana - Journal of Physics

A q deformation of Gell-Mann-Okubo mass formula

We study shallow water equations to derive analytical conditions for the existence of finite amplitude nonlinear wave solutions. The bounded solutions obtained by us include solitary wave, periodic trigonometrical and decaying exponential types.

Journal of the Physical Society of Japan

Exploring Solutions of Nonlinear Rossby Waves in Shallow Water Equations

Hydrogen is the lightest element in nature, and so, its detection and quantitative analysis is difficult by the conventional methods utilized for other elements. In the recent years the technique of elastic recoil detection analysis (ERD) using 1-2 MeV He+ beam has been developed to quantitatively and simultaneously analyze hydrogen and its isotopes in solids. Such a facility has been set up using the 2 MeV Van-de-Graaff accelerator at IIT Kanpur. It facilitates H and D analysis in a material up to a depth of ∼1 μm with a detection sensitivity of 0.1 at.% and depth resolution of about 300 Å. The application potential of this setup is illustrated by presenting the results of measurements performed on Al:H:D systems prepared by plasma source ion implantation and high TC YBCO pellets exposed to humid atmosphere.

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Bulletin of Materials Science

ERD facility for analysis of hydrogen and deuterium in solids

This letter reports room-temperature synthesis by ion beam mixing of the ε1-Cu3Ge phase which is a promising candidate for interconnect and contact material in very large scale integrated circuit technology. The resistivity of the mixed sample was found to be nearly the same as the one obtained from thermally prepared films. We briefly discuss the likely mechanisms of phase formation and conclude that reaction kinetics dominates over thermodynamic forces during phase formation. The sequence of phase formation is explained by effective heat of formation rule.© 1995 American Institute of Physics.

Applied Physics Letters

Room-temperature synthesis of copper germanide phase by ion beam mixing

Progress of Theoretical Physics

SO(2, 1), Supersymmetry and D-Dimensional Radial Schrodinger Equation

In this Letter some basic properties of a truncated oscillator are studied. By using finite-dimensional representation matrices of the truncated oscillator we construct new parasupersymmetric schemes and remark on their relevance to the transition operators of the non-interacting N-level system endowed with bosonic modes. © 1995.

Physics Letters A

A new look at the harmonic oscillator problem in a finite-dimensional Hilbert space

Some implications of a generalized quantum condition in connection with supersymmetric quantum mechanics are studied. By defining suitable representations for the supercharges in terms of the Pauli matrices I show that Brzeziński et al.'s recent scheme of a modified oscillator can be extended to a wider class of superpotentials. © 1994.