Superconductivity in the PbO-type structure α-FeSe
By F. Hsu, J. Luo, K. Yeh, T. Chen, Tzu-Wen Huang, Phillip M. Wu, Yong-Chi Lee, Yi-lin Huang, Y. Chu, D. Yan and 1 more. Proceedings of the National Academy of Sciences of the United States of America, 2008
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The recent discovery of superconductivity with relatively high transition temperature (Tc) in the layered iron-based quaternary oxypnictides La[O1−xFx] FeAs by Kamihara et al. [Kamihara Y, Watanabe T, Hirano M, Hosono H (2008) Iron-based layered superconductor La[O1-xFx] FeAs (x = 0.05–0.12) with Tc = 26 K. J Am Chem Soc 130:3296–3297.] was a real surprise and has generated tremendous interest. Although superconductivity exists in alloy that contains the element Fe, LaOMPn (with M = Fe, Ni; and Pn = P and As) is the first system where Fe plays the key role to the occurrence of superconductivity. LaOMPn has a layered crystal structure with an Fe-based plane. It is quite natural to search whether there exists other Fe based planar compounds that exhibit superconductivity. Here, we report the observation of superconductivity with zero-resistance transition temperature at 8 K in the PbO-type α-FeSe compound. A key observation is that the clean superconducting phase exists only in those samples prepared with intentional Se deficiency. FeSe, compared with LaOFeAs, is less toxic and much easier to handle. What is truly striking is that this compound has the same, perhaps simpler, planar crystal sublattice as the layered oxypnictides. Therefore, this result provides an opportunity to better understand the underlying mechanism of superconductivity in this class of unconventional superconductors.
Subfields: Accounting, Electronic, Optical and Magnetic Materials
View Paper: https://www.semanticscholar.org/paper/9071babf9e9ea7edcf9252fdd3dde0b4a51d81ef
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Citations in the corpus
- Colloquium: The unexpected properties of alkali metal iron selenide superconductors (2012, background): “A typical example is FeSe that also superconducts, although at a lower Tc of 8 K (Hsu et al., 2008).”
- Superconductivity in iron compounds (2011, background): “The MFeAs (‘‘111’’) family (X. C. Wang et al., 2008, Tc ¼ 18 K), the iron chalcogenide FeSe (‘‘11’’) family (Hsu et al., 2008, Tc ¼ 8 K), the Sr2MO3FePn, M ¼ Sc, V, Cr (‘‘21311’’) family (M ¼ Sc and Pn ¼ P, Ogino et al., 2009, Tc ¼ 17 K; M ¼ V and Pn ¼ As, Zhu et al., 2009b, Tc ¼ 37 K) and the…”
- Tellurium substitution effect on superconductivity of the α-phase iron selenide (2008, background): “eSe0.5Te0.5 crystal lattice already distorts to form the structure with space group P-1 as seen in Fig. 4(a). This is closely correlated with what is observed for the FeSe at temperatures below 105 K [1]. This result indicates that partially substituted Te-atom induces a local strain in the lattice.”
- Phase diagram and electronic indication of high-temperature superconductivity at 65 K in single-layer FeSe films. (2012, background): “Second, the discovery of such a high-Tc in the single-layer FeSe film is surprising when considering that its bulk counterpart has a Tc only at 8 K[9] although it can be enhanced to 36.”