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Superconductivity and magnetism in K-doped EuFe(2)As(2).
Anupam1, P L Paulose, H S Jeevan
1Department of Physics, Indian Institute of Technology, Kanpur 208016, India.
Summary
Superconductivity emerges in K-doped EuFe2As2 below 33 K, suppressing iron magnetism but coexisting with short-range europium ordering. This interplay between Eu magnetism and superconductivity is observed.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Solid State Chemistry
Background:
- EuFe2As2 exhibits iron (Fe) magnetic ordering at 190 K.
- Investigating the effects of doping on the interplay between magnetism and superconductivity in iron-based superconductors is crucial.
Purpose of the Study:
- To explore the impact of potassium (K) doping on the superconducting properties of EuFe2As2.
- To determine the coexistence or suppression of magnetic order and superconductivity in K-doped EuFe2As2.
Main Methods:
- Electrical resistivity measurements.
- Magnetic susceptibility analysis.
- Mössbauer spectroscopy using Fe-57 and Eu-151 isotopes.
Main Results:
- Superconductivity was observed in 50% K-doped EuFe2As2 samples below 33 K.
- Iron magnetic order at 190 K is completely suppressed by K doping.
- Short-range ordering of europium (Eu) moments coexists with superconductivity below 15 K.
- Evidence of interplay between Eu magnetism and superconductivity was detected via susceptibility and Mössbauer spectroscopy.
Conclusions:
- Potassium doping effectively suppresses the Fe magnetic order in EuFe2As2, enabling superconductivity.
- Europium magnetism exhibits short-range ordering that coexists with the superconducting state.
- An interaction between Eu magnetism and superconductivity is present, influencing the material's properties.
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