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Tunneling spectroscopy of underdoped NaFe1-xCoxAs pnictides in the normal state
Russian version
Nikitchenkov I. A.1,2, Kuzmichev S. A.1,2, Ilina A. D.2, Morozov I. V.3, Shilov A. I.2, Rakhmanov Ye. O.3,2, Kuzmicheva T. E.2
1Moscow State University, Moscow, Russia
2Lebedev Physical Institute, Russian Academy of Sciences, Moscow, Russia
3Department of Chemistry, Lomonosov Moscow State University, Moscow, Russia
Email: nikitchenkov.ia19@physics.msu.ru
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Single crystals of underdoped NaFe0.979Co0.021As pnictides (i. e., with a deficiency of substituting cobalt compared to the compound possessing the maximum critical temperature Tc) were studied using tunneling spectroscopy in the superconducting and the normal state. The obtained dI(V)/dV-characteristics of tunneling contacts reproducibly showed residual nonlinearity both below and above the critical temperature. This nonlinearity, being unusual for conventional tunneling junction, was not directly related to the superconducting properties and disappeared at T~ 60 K. Possible origin of this nonlinearity and its potential relation with the nematicity of the electronic subsystem are discussed. Keywords: high temperature superconductivity, iron arsenide, break-junction, phase diagram.
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