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  Persistent antiferromagnetic order in heavily overdoped Ca1−xLaxFeAs2

Martino, E., Bachmann, M. D., 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. doi:10.1088/1361-648X/ab3b43.

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Item Permalink: https://hdl.handle.net/21.11116/0000-000B-7831-7 Version Permalink: https://hdl.handle.net/21.11116/0000-000B-7832-6
Genre: Journal Article

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https://doi.org/10.1088/1361-648X/ab3b43 (Publisher version)
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 Creators:
Martino, Edoardo1, Author
Bachmann, Maja D.1, Author
Rossi, Lidia1, Author
Modic, Kimberly A.1, Author
Zivkovic, Ivica1, Author
Ronnow, Henrik M.1, Author
Moll, Philip J. W.1, Author
Akrap, Ana1, Author
Forro, Laszlo1, Author
Katrych, Sergiy1, Author
Affiliations:
1external, ou_persistent22              

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 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 TN  =  120 K, 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.

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Language(s): eng - English
 Dates: 2019
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1088/1361-648X/ab3b43
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Title: Journal of Physics: Condensed Matter
  Abbreviation : J. Phys. Condens. Matter.
Source Genre: Journal
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Publ. Info: Bristol : IOP Publishing
Pages: - Volume / Issue: 31 (48) Sequence Number: 485705 Start / End Page: - Identifier: ISSN: 0953-8984
CoNE: https://pure.mpg.de/cone/journals/resource/954928562478