English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Journal Article

Persistent antiferromagnetic order in heavily overdoped Ca1−xLaxFeAs2

MPS-Authors
There are no MPG-Authors in the publication available
External Resource
Fulltext (restricted access)
There are currently no full texts shared for your IP range.
Fulltext (public)
There are no public fulltexts stored in PuRe
Supplementary Material (public)
There is no public supplementary material available
Citation

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.


Cite as: https://hdl.handle.net/21.11116/0000-000B-7831-7
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.