H. Z. Arham, C. R. Hunt, W. K. Park, J. Gillett, S. D. Das, S. E. Sebastian, Z. J. Xu, J. S. Wen, Z. W. Lin, Q. Li, G. Gu, A. Thaler, S. L. Budko, P. C. Canfield, L. H. Greene. Gap-like feature in the normal state of X(fe1-xcox)2as2, X = Ba; Sr and Fe1+yte revealed by Point Contact Spectroscopy

Natural Sciences / Physics / Condensed Matter Physics

Submitted on: Aug 31, 2012, 16:32:06

Description: 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.

The Library of Congress (USA) reference page : http://lccn.loc.gov/cn2013300046.

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