Physics – Condensed Matter – Superconductivity
Scientific paper
2010-04-12
Phys. Rev. B 82, 014511 (2010)
Physics
Condensed Matter
Superconductivity
2 figures
Scientific paper
10.1103/PhysRevB.82.014511
The lattice dynamics and the effect of pressure on superconducting LiFeAs in both nonmagnetic (NM) and striped antiferromagnetic (SAF) phases are investigated using the plane-wave pseudopotential, density-functional-based method. While the obtained electron-phonon coupling $\lambda$ is very small for the NM calculation, the softening of phonon in the SAF phase may lead to a large increase in $\lambda$. In the SAF phase, strong anisotropy of the phonon softening in the Fe plane is found to arise from different spin orders in the $x$ and $y$ directions, indicating that the phonon softening is of spin-phonon coupling origin. For the SAF structure, the calculated variation trend of the electronic density of states and the phonon frequencies under pressure can explain a large negative pressure coefficient of $T_{c}$ in the LiFeAs compound.
Huang Gui Qin
Xing Ding-Yu
Xing Z. W.
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