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Structural, electronic and optical properties of YNi4Si-type RNi4Si compounds (R = La and Gd): a new orthorhombic derivative of CaCu5 structure

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Abstract

The structural, electronic and optical properties of new YNi4Si-type RNi4Si (R = La and Gd) compounds are studied using full-potential augmented plane-wave method. To account better for the on-site f electron correlation, we adopted the Coulomb-corrected local spin density approximation (LSDA + U) exchange–correlation potential. Our optimized results of lattice parameters show good agreement to the previously reported experimental study. Analysis of the calculated band structure of LaNi4Si and GdNi4Si compounds demonstrates their metallic character. We found Ni-3d states mainly contribute to density of states from −5.0 eV to the Fermi level which is consistent with experiment and previously reported result by Kowalczyk et al. (J Magn Magn Mater 305:348–351, 2006), having hexagonal CaCu5 structure. Our calculated optical conductivity compares well with the experimental data and the results are analysed in the light of band-to-band transitions.

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Acknowledgements

The work was financially supported by the CCOST Project, Raipur (C.G), India, through sanction no. 2161/CCOST/MRP/2013. Fruitful discussions with Professor T. Nautiyal are gratefully acknowledged.

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  1. Department of Physics, National Institute of Technology Raipur, Raipur, Chhattisgarh, India

    Dinesh Kumar Maurya & Sapan Mohan Saini

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  1. Dinesh Kumar Maurya
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  2. Sapan Mohan Saini
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Correspondence to Sapan Mohan Saini.

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Maurya, D.K., Saini, S.M. Structural, electronic and optical properties of YNi4Si-type RNi4Si compounds (R = La and Gd): a new orthorhombic derivative of CaCu5 structure. J Mater Sci 51, 868–875 (2016). https://doi.org/10.1007/s10853-015-9411-4

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  • DOI: https://doi.org/10.1007/s10853-015-9411-4

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