Persistent antiferromagnetic order in heavily overdoped Ca\(_{1-x}\)La\(_x\)FeAs\(_2\)

In the Ca\(_{1-x}\)La\(_x\)FeAs\(_2\) (112) family of pnictide superconductors, we have investigated a highly overdoped composition (x = 0.56), prepared by high-pressure, high-temperature synthesis. Magnetic measurements show an antiferromagnetic transition at TN = 120K, well above the one at lower...

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Bibliographic Details
Published in:arXiv.org 2019-05
Main Authors: Martino, Edoardo, Bachmann, Maja D, Rossi, Lidia, Modic, Kimberly A, Zivkovic, Ivica, Rønnow, Henrik M, Moll, Philip J W, Akrap, Ana, ró, László, Katrych, Sergiy
Format: Article
Language:English
Subjects:
Antiferromagnetism
Conductors
Group 5A compounds
Hall effect
High temperature superconductors
Magnetic measurement
Phase diagrams
Seebeck effect
Superconductivity
Synthesis
Temperature dependence
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Summary:In the Ca\(_{1-x}\)La\(_x\)FeAs\(_2\) (112) family of pnictide superconductors, we have investigated a highly overdoped composition (x = 0.56), prepared by high-pressure, high-temperature synthesis. Magnetic measurements show an antiferromagnetic transition at TN = 120K, well above the one at lower doping (0.15 < x < 0.27). Below the onset of long-range magnetic order at TN, 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.
ISSN:2331-8422
DOI:10.48550/arxiv.1905.08640