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208 results on '"Gupta, D. C."'

11. Quaternary Heusler alloy CoNbMnGa as ferromagnetic semiconductor

Author

Seh, Ab Quyoom, primary, Yousuf, S., additional, Bhat, T. M., additional, Singh, S., additional, Mir, S. A., additional, Sofi, S. A., additional, Khandy, S. A., additional, Nabi, M., additional, Kumar, P., additional, Ganie, N. A., additional, Mir, R. A., additional, Rasool, A., additional, and Gupta, D. C., additional

Published
2020
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17. Investigation of Magneto-electronic Properties of Double Perovskite Ba2ZnReO6.

Author

Khandy, Saveer Ahmad, Yousuf, S., Bhat, T. M., Singh, S., Saleem, Z., Mir, S. A., Sofi, S. A., Seh, Ab Q., Nabi, M., and Gupta, D. C.

Subjects
PEROVSKITE, MAGNETIC moments, LATTICE constants, PLANE wavefronts, MAGNETIC properties
Abstract

We report the structural, magneto-electronic, mechanical and thermo-physical properties of barium based Ba2ZnReO6 double perovskite using full potential linearized augmented plane wave method (FPLAPW). The structural characterization in all possible magnetic states and band profile display Fm-3m as stable phase group with half-metallic nature. The optimized lattice parameter of 8.080 Å and band gap of 2.49 eV show fair agreement with experimental results. The magnetic properties define the Re+6 (5d1, t2g1) orbital electron responsible for showing the ferromagnetic interaction together with half-metallic nature and integral spin magnetic moment of 1.0 􀈝B. [ABSTRACT FROM AUTHOR]

Published
2019
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18. Structural and Elasto-Mechanical Properties of Ordered Double Perovskite Ba2LuSbO6.

Author

Mir, Shabir Ahmad, Yousuf, S., Bhat, T. M., Singh, S., Seh, Ab Q., Khandy, Saveer A., Sofi, S. A., Saleem, Z., and Gupta, D. C.

Subjects
ELASTIC constants, PEROVSKITE, LATTICE constants, PLANE wavefronts, ELASTIC modulus
Abstract

Here we comment on the structural and mechanical properties of double perovskite Ba2LuSbO6 for first time, via ab-initio method. Full potential Linearized augmented plane wave (FP-LAPW) method in two approximations, local spin density approximation (LSDA) and generalized gradient approximation (GGA), reveal second one predicts the correct ground state properties. The calculated lattice constant is found consistent with the experimental result. Second order elastic constants and other elastic moduli were calculated. The computed mechanical parameters reveal the brittle anisotropic nature of Ba2LuSbO6. [ABSTRACT FROM AUTHOR]

Published
2019
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28. Robustness in spin polarization and thermoelectricity in newly tailored Mn2-based Heusler alloys.

Author

Yousuf, S. and Gupta, D. C.

Abstract

Investigation of electronic structure, magnetism, hybridization and thermoelectricity of Mn2-based Heusler alloys within the framework of DFT simulation technique have been carried out. Through the optimized ground state parameters viz., lattice constant, total energy and bulk’s modulus, electronic properties, magnetic properties and thermoelectric response of new tailored materials is reported. Mechanically stable with ductile nature and 100% spin polarization could favor their use in future spintronic materials. Thermoelectric properties are investigated through the variation of carrier concentration and temperature. Power factor analysis show a way for the selection of the optimal carrier concentration responsible for increasing their thermoelectric response with temperature. The power factor of 857.51 (966.16) × 109µW K−2 m−1 s−1 at an optimal concentration of 1018 cm−3 and temperature of 800 K for Mn2YSn (Mn2ZnSn) respectively is obtained. The Seebeck coefficient portray them as p-type materials and show a linear increase with temperature and vice versa for the carrier concentrations. [ABSTRACT FROM AUTHOR]

Published
2018
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29. Evaluation of Mechanical and Transport Properties of Zr2CoSi Heusler Alloy.

Author

Yousuf, Saleem, Khandy, S. A., Bhat, T. M., and Gupta, D. C.

Subjects
ZIRCONIUM alloys, COBALT silicide, HEUSLER alloys, MECHANICAL properties of metals, DENSITY functional theory
Abstract

Systematic investigation of mechanical and transport properties of Zr2CoSi within the density functional theory have been analysed. From the elastic constants, the shear modulus, Young's modulus, Poisson's ratio, we conclude the ductile nature of alloy. Thermoelectric properties show that Zr2CoSi as an n-type thermoelectric material with a higher increase in Seebeck coefficient with temperature. Further the power factor analysis confirms the heavily doping of the alloy fruitful for increase in thermoelectric performance and its use for the future thermoelectric spin generators. [ABSTRACT FROM AUTHOR]

Published
2017
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36. GPS measurements of postseismic deformation in the Andaman-Nicobar region following the giant 2004 Sumatra-Andaman earthquake

Author

Gahalaut, V. K., primary, Jade, S., additional, Catherine, J. K., additional, Gireesh, R., additional, Ananda, M. B., additional, Kumar, P., additional, Narsaiah, M., additional, Jafri, S. S. H., additional, Ambikapathy, A., additional, Bansal, A., additional, Chadha, R. K., additional, Gupta, D. C., additional, Nagarajan, B., additional, and Kumar, S., additional

Published
2008
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41. Structural Properties of CsI

Author

Baghmar, Deoshree, primary, Mehto, Varsha. R., additional, Gaur, N. K., additional, Gupta, D. C., additional, Predeep, P., additional, Prasanth, S., additional, and Prasad, A. S., additional

Published
2008
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