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

E. Martino, M.D. Bachmann, L. Rossi, K.A. Modic, I. Zivkovic, H.M. Rønnow, P.J.W. Moll, A. Akrap, L. Forró, S. Katrych, Journal of Physics: Condensed Matter 31 (2019).


Journal Article | Published | English
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Abstract
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 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.
Publishing Year
Date Published
2019-09-03
Journal Title
Journal of Physics: Condensed Matter
Volume
31
Issue
48
Article Number
485705
ISSN
eISSN
IST-REx-ID

Cite this

Martino E, Bachmann MD, Rossi L, et al. Persistent antiferromagnetic order in heavily overdoped Ca1−x La x FeAs2. Journal of Physics: Condensed Matter. 2019;31(48). doi:10.1088/1361-648x/ab3b43
Martino, E., Bachmann, M. D., Rossi, L., Modic, K. A., Zivkovic, I., Rønnow, H. M., … Katrych, S. (2019). Persistent antiferromagnetic order in heavily overdoped Ca1−x La x FeAs2. Journal of Physics: Condensed Matter, 31(48). https://doi.org/10.1088/1361-648x/ab3b43
Martino, Edoardo, Maja D Bachmann, Lidia Rossi, Kimberly A Modic, Ivica Zivkovic, Henrik M Rønnow, Philip J W Moll, Ana Akrap, László Forró, and Sergiy Katrych. “Persistent Antiferromagnetic Order in Heavily Overdoped Ca1−x La x FeAs2.” Journal of Physics: Condensed Matter 31, no. 48 (2019). https://doi.org/10.1088/1361-648x/ab3b43.
E. Martino et al., “Persistent antiferromagnetic order in heavily overdoped Ca1−x La x FeAs2,” Journal of Physics: Condensed Matter, vol. 31, no. 48, 2019.
Martino E, Bachmann MD, Rossi L, Modic KA, Zivkovic I, Rønnow HM, Moll PJW, Akrap A, Forró L, Katrych S. 2019. Persistent antiferromagnetic order in heavily overdoped Ca1−x La x FeAs2. Journal of Physics: Condensed Matter. 31(48), 485705.
Martino, Edoardo, et al. “Persistent Antiferromagnetic Order in Heavily Overdoped Ca1−x La x FeAs2.” Journal of Physics: Condensed Matter, vol. 31, no. 48, 485705, IOP Publishing, 2019, doi:10.1088/1361-648x/ab3b43.

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