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Persistent antiferromagnetic order in heavily overdoped Ca1-x La x FeAs2

Martino, Edoardo ; Bachmann, Maja D ; Rossi, Lidia ; Modic, Kimberly A ; Zivkovic, Ivica ; Rønnow, Henrik M ; Moll, Philip J W ; Akrap, Ana ; Forró, László ; Katrych, Sergiy

In: Journal of Physics: Condensed Matter, 2019, vol. 31, no. 48, p. 485705

In the Ca1−x La x FeAs2 (1 1 2) family of pnictide superconductors, we have investigated a highly overdoped composition (x = 0.56), prepared by a high-pressure, high-temperature synthesis. Magnetic measurements show an antiferromagnetic transition at T N = 120 K, well above the one at lower doping (0.15 < x < 0.27).Below the onset of long-range...