Interplay between superconductivity and magnetism in Cu-doped FeSe under pressure

Shylin SI, Ksenofontov V, Naumov PG, Medvedev SA, Felser C (2018)

Publication Type: Journal article

Publication year: 2018

Journal

Journal of Superconductivity and Novel Magnetism Springer Verlag (Germany)

Book Volume: 31

Pages Range: 763-769

Journal Issue: 3

DOI: 10.1007/s10948-017-4317-9

Abstract

Superconductivity in iron selenide is very sensitive to any dopants at levels of only a few percent. Here, we demonstrate how iron substitution by copper destroys superconductivity in FeSe, and argue why superconductivity reemerges under pressure. Detailed Mössbauer spectroscopy studies on 57 Fe-enriched Cu0.04 Fe0.97 Se reveal that at low temperatures part of the iron sites is magnetically ordered, and static magnetic moments destroy the superconducting pairing. Application of pressure leads to a collapse of the static magnetism and restoration of superconductivity with the maximal Tc value at pressure ∼ 8 GPa. The further pressure increase provokes a structural tetragonal-to-hexagonal phase transition and disappearance of superconductivity similarly to FeSe. The hyperfine parameters of the non-superconducting hexagonal phase of Cu0.04 Fe0.97 Se reveal a less covalent character of Fe–Se bonds and a noticeable higher value of the electric field gradient comparing to the tetragonal phase.

Involved external institutions

Johannes Gutenberg-Universität Mainz (JGU) DE Germany (DE) Max-Planck-Institut für Chemische Physik fester Stoffe (MPI CPfS) / Max Planck Institute for Chemical Physics of Solids DE Germany (DE)

How to cite

APA:

Shylin, S.I., Ksenofontov, V., Naumov, P.G., Medvedev, S.A., & Felser, C. (2018). Interplay between superconductivity and magnetism in Cu-doped FeSe under pressure. Journal of Superconductivity and Novel Magnetism, 31(3), 763-769. https://doi.org/10.1007/s10948-017-4317-9

MLA:

Shylin, Sergii I., et al. "Interplay between superconductivity and magnetism in Cu-doped FeSe under pressure." Journal of Superconductivity and Novel Magnetism 31.3 (2018): 763-769.

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