First-principles investigation of superconductivity in the body-centred tetragonal LaRu2P2
Taylor & Francis
This is the author accepted manuscript. The final version is available from Taylor & Francis via the DOI in this record.
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© 2016 Informa UK Limited, trading as Taylor & Francis Group.We have investigated the ground state and electronic properties of LaRu2P2 in the ThCr2Si2 structure using a generalised gradient approximation of the density functional theory and the ab initio pseudopotential method. We find that the calculated electronic properties of LaRu2P2 exhibit three-dimensional rather than two-dimensional characteristics in spite of the apparent two dimensionality in its atomic structure. An interesting feature of the phonon dispersion curves is the phonon anomaly in the lowest transverse acoustic branch as well as the longitudinal acoustic branch. We have shown that these phonon anomalies give rise to large electron-phonon interaction, as is evident from the calculated Eliashberg spectral function α2) F(ω) By integrating this spectral function, the value of average electron-phonon coupling parameter is calculated to be 0.85, from which the superconducting critical temperature is estimated to be 3.74 K, in gratifying accord with its experimental value of 4.0 K.
This work was supported by the Scientific and Technical Research Council of Turkey (TÜB˙ITAK) [project number MFAG-114F192].
Philosophical Magazine, 2016, Vol. 96, Issue 19, pp. 2059 - 2073