Strong-coupling electron-phonon superconductivity in noncentrosymmetric 
quasi-one-dimensional K2Cr3As3

Subedi, Alaska

doi:10.1103/PhysRevB.92.174501

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Strong-coupling electron-phonon superconductivity in noncentrosymmetric quasi-one-dimensional K₂Cr₃As₃

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Subedi, Alaska
Theory of Complex Materials, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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http://dx.doi.org/10.1103/PhysRevB.92.174501
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http://arxiv.org/abs/1508.00825
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PhysRevB.92.174501.pdf
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Citation

Subedi, A. (2015). Strong-coupling electron-phonon superconductivity in noncentrosymmetric quasi-one-dimensional K₂Cr₃As₃. Physical Review B, 92(17): 174501. doi:10.1103/PhysRevB.92.174501.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0029-2D14-7

Abstract

I study the lattice dynamics and electron-phonon coupling in noncentrosymmetric quasi-one-dimensional K₂Cr₃As₃ using density functional theory based first principles calculations. The phonon dispersions show stable phonons without any soft-mode behavior. They also exhibit features that point to a strong interaction of K atoms with the lattice. I find that the calculated Eliashberg spectral function shows a large enhancement around 50 cm⁻¹. The phonon modes that show large coupling involve in-plane motions of all three species of atoms. The q dependent electron-phonon coupling decreases strongly away from the q_z=0 plane. The total electron-phonon coupling is large, with a value of λ_ep=3.0, which readily explains the experimentally observed large mass enhancement.