Electron-Hole Asymmetry in Superconductivity of Pnictides Originated from the Observed Rigid Chemical Potential Shift - Condensed Matter > SuperconductivityReportar como inadecuado




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Abstract: We have performed a systematic photoemission study of the chemical potentialshift as a function of carrier doping in a pnictide system based onBaFe$ 2$As$ 2$. The experimentally determined chemical potential shift isconsistent with the prediction of a rigid band shift picture by therenormalized first-principle band calculations. This leads to an electron-holeasymmetry EHA in the Fermi surface FS nesting condition due to differenteffective masses for different FS sheets, which can be calculated from theLindhard function of susceptibility. This built-in EHA from the band structure,which matches well with observed asymmetric superconducting domes in the phasediagram, strongly supports FS near-nesting driven superconductivity in the ironpnictides.



Autor: M. Neupane, P. Richard, Y.-M. Xu, K. Nakayama, T. Sato, T. Takahashi, A. V. Fedorov, G. Xu, X. Dai, Z. Fang, Z. Wang, G.-F. Chen,

Fuente: https://arxiv.org/







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