Abstract
We report on the discovery and novel physics of a new superconductivity dome in LaFeAsO1−x F x with high-doping rate (0.25 ≤x≤0.75) synthesized by using the high-pressure technique. The maximal critical temperature T c = 30 K peaked at x opt = 0.5 ∼0.55, which is even higher than that at x≤ 0.2. By nuclear magnetic resonance (NMR), we find that the new superconducting dome is far away from a magnetically ordered phase without low-energy magnetic fluctuations. Instead, NMR and transmission electron microscopy measurements indicate that a C4 rotation symmetry-breaking structural transition takes place for x> 0.5 above T c . The electrical resistivity shows a temperature-linear behavior around the doping level where the crystal transition temperature extrapolate to zero and T c is the maximal, suggesting the importance of quantum fluctuations associated with the structural transition. Our results point to a new paradigm of high temperature superconductivity.
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This article is part of the Topical Collection on Proceedings of the International Conference on Hyperfine Interactions and their Applications (HYPERFINE 2016), Leuven, Belgium, 3-8 July 2016
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Yang, J., Zheng, Gq. New superconductivity dome in LaFeAsO1−x F x far away from magnetism and accompanied by structural transition. Hyperfine Interact 237, 141 (2016). https://doi.org/10.1007/s10751-016-1355-9
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DOI: https://doi.org/10.1007/s10751-016-1355-9