Effect of interlayer coupling on the coexistence of antiferromagnetism and superconductivity in Fe pnictide superconductors: A study ofCa0.74(1)La0.26(1)(Fe1−xCox)As2single crystals Academic Article uri icon

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abstract

  • We report the transport, thermodynamic, $\mu$SR and neutron study of the Ca$_{0.74(1)}$La$_{0.26(1)}$(Fe$_{1-x}$Co$_{x}$)As$_{2}$ single crystals, mapping out the temperature-doping level phase diagram. Upon Co substitution on the Fe site, the structural/magnetic phase transitions in this 112 compound are suppressed and superconductivity up to 20 K occurs. Our measurements of the superconducting and magnetic volume fractions show that these two phases coexist microscopically in the underdoped region, in contrast to the related 10-3-8 Ca$_{10}$(Pt$_{3}$As$_{8}$)((Fe$_{1-x}$Pt$_x$)$_{2}$As$_{2}$)$_{5}$ compound, where coexistence is absent. Supported by model calculations, we discuss the differences in the phase diagrams of the 112 and 10-3-8 compounds in terms of the FeAs interlayer coupling, whose strength is affected by the character of the spacer layer, which is metallic in the 112 and insulating in the 10-3-8.

authors

  • Jiang, Shan
  • Liu, Lian
  • Schütt, Michael
  • Hallas, Alannah M
  • Shen, Bing
  • Tian, Wei
  • Emmanouilidou, Eve
  • Shi, An-chang
  • Luke, Graeme
  • Uemura, Yasutomo J
  • Fernandes, Rafael M
  • Ni, Ni

publication date

  • May 23, 2016