Gap-like feature in the normal state of X(Fe₁₋ₓCoₓ)₂As₂, X=Ba,Sr and Fe₁₊yTe revealed by Point Contact Spectroscopy

Arham, H. Z.; Hunt, C. R.; Park, W. K.; Gillett, J.; Das, S. D.; Sebastian, S. E.; Xu, Z. J.; Wen, J. S.; Lin, Z. W.; Li, Q.

doi:10.1088/1742-6596/400/2/022001

arXiv 2011-08-13 DOI 10.1088/1742-6596/400/2/022001 0 مشاهدة

Gap-like feature in the normal state of X(Fe₁₋ₓCoₓ)₂As₂, X=Ba,Sr and Fe₁₊yTe revealed by Point Contact Spectroscopy

Arham, H. Z. · Hunt, C. R. · Park, W. K. · Gillett, J. · Das, S. D. · Sebastian, S. E. · Xu, Z. J. · Wen, J. S. · Lin, Z. W. · Li, Q. · Gu, G. · Thaler, A. · Budko, S. L. · Canfield, P. C. · Greene, L. H.

Superconductivity

الأصل · EN

Point contact spectroscopy reveals a gap-like feature above the magnetic and structural transition temperatures for underdoped Ba(Fe₁₋ₓCoₓ)₂As₂, SrFe₂As₂ and Fe₁₊yTe. The conductance spectrum starts showing an enhancement at temperatures as high as 177 K for BaFe₂As₂ (Tₙ 132 K) and 250 K for SrFe₂As₂ (Tₙ 192 K). Possible origins for this enhancement are discussed in light of recent experimental claims of nematicity in these materials. We construct a modified phase diagram for Co-doped Ba122 showing a gap-like feature existing above Tₙ and Tₛ for the underdoped regime.

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