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Gap-like feature in the normal state of bf{X(Fe_(1-x)Co_x)₂As₂}, bf{X=Ba,Sr} and bf{Fe_(1+y)Te} revealed by Point Contact Spectroscopy

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arxiv 1108.2749 v1 pith:72SQ5HLV submitted 2011-08-13 cond-mat.supr-con

Gap-like feature in the normal state of bf{X(Fe_(1-x)Co_x)₂As₂}, bf{X=Ba,Sr} and bf{Fe_(1+y)Te} revealed by Point Contact Spectroscopy

H. Z. Arham , C. R. Hunt , W. K. Park , J. Gillett , S. D. Das , S. E. Sebastian , Z. J. Xu , J. S. Wen
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Z. W. Lin Q. Li G. Gu A. Thaler S. L. Budko P. C. Canfield L. H. Greene
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classification cond-mat.supr-con
keywords featuregap-likeabovecontactenhancementpointshowingspectroscopy
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Point contact spectroscopy reveals a gap-like feature above the magnetic and structural transition temperatures for underdoped $Ba(Fe_{1-x}Co_x)_2As_2$, $SrFe_2As_2$ and $Fe_{1+y}Te$. The conductance spectrum starts showing an enhancement at temperatures as high as 177 K for $BaFe_2As_2$ ($T_N$ $\sim$ 132 K) and 250 K for $SrFe_2As_2$ ($T_N$ $\sim$ 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 $T_N$ and $T_S$ for the underdoped regime.

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