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

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, , Citation H Z Arham et al 2012 J. Phys.: Conf. Ser. 400 022001 DOI 10.1088/1742-6596/400/2/022001

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1 Department of Physics and the Frederick Seitz Material Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA

2 Cavendish Laboratory, J J Thomson Ave, University of Cambridge, UK

3 Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York, 11973, USA

4 Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, IA, 50011, USA

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1742-6596/400/2/022001

Abstract

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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10.1088/1742-6596/400/2/022001