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Persistent antiferromagnetic order in heavily overdoped Ca1-xLaxFeAs2

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Martino,  Edoardo
Physics of Microstructured Quantum Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Bachmann,  Maja
Physics of Microstructured Quantum Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Modic,  Kimberly A.
Physics of Microstructured Quantum Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Moll,  Philip J. W.
Physics of Microstructured Quantum Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Martino, E., Bachmann, M., Rossi, L., Modic, K. A., Zivkovic, I., Ronnow, H. M., et al. (2019). Persistent antiferromagnetic order in heavily overdoped Ca1-xLaxFeAs2. Journal of Physics: Condensed Matter, 31(48): 485705, pp. 1-6. doi:10.1088/1361-648X/ab3b43.


Cite as: http://hdl.handle.net/21.11116/0000-0004-BD1A-B
Abstract
In the Ca1-xLaxFeAs2 (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 magnetic order at T-N, the electrical resistivity is strongly reduced and is dominated by electron-electron interactions, as evident from its temperature dependence. The Seebeck coefficient shows a clear metallic behavior as in narrow band conductors. The temperature dependence of the Hall coefficient and the violation of Kohler's rule agree with the multiband character of the material. No superconductivity was observed down to 1.8 K. The success of the high-pressure synthesis encourages further investigations of the so far only partially explored phase diagram in this family of Iron-based high temperature superconductors.