Journal article
Magnetic phases in superconducting, polycrystalline bulk FeSe samples

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Publication Details
Author list: Quentin Nouailhetas, Anjela Koblischka-Veneva, Michael R. Koblischka, Pavan Kumar Naik S., Florian Schäfer, H. Ogino, Christian Motz, Kévin Berger, Bruno Douine, Yassine Slimani, and Essia Hannachi
Publisher: American Institute of Physics (AIP)
Publication year: 2021
Volume number: 11
Issue number: 1
Start page: 1
End page: 5
Number of pages: 5
ISSN: 2158-3226
Web of Science ID: 000609445800007
PubMed ID:
Scopus ID: 85099394757
eISSN: 2158-3226

The FeSe compound is the simplest high-temperature superconductor (HTSc) possible, and relatively cheap, not containing any rare-earth material. Although the transition temperature, Tc, is just below 10 K, the upper critical fields are comparable with other HTSc. Preparing FeSe using solid-state sintering yields samples exhibiting strong ferromagnetic hysteresis loops (MHLs), and the superconducting contribution is only visible after subtracting MHLs from above Tc. Due to the complicated phase diagram, the samples are a mixture of several phases, the superconducting β-FeSe, and the non-superconducting δ-FeSe and γ-FeSe. Furthermore, antiferromagnetic Fe7Se8 and ferromagnetic α-Fe may be contained, depending directly on the Se loss during the sintering process. Here, we show MHLs measured up to ±7 T and determine the magnetic characteristics, together with the amount of superconductivity determined from M(T) measurements. We also performed a thorough analysis of the microstructures in order to establish a relation between microstructure and the resulting sample properties.

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Last updated on 2021-21-03 at 13:27