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- Title
Maximizing T<sub>c</sub> by tuning nematicity and magnetism in FeSe<sub>1-x</sub>S<sub>x</sub> superconductors.
- Authors
Matsuura, K.; Mizukami, Y.; Arai, Y.; Sugimura, Y.; Maejima, N.; Machida, A.; Watanuki, T.; Fukuda, T.; Yajima, T.; Hiroi, Z.; Yip, K. Y.; Chan, Y. C.; Niu, Q.; Hosoi, S.; Ishida, K.; Mukasa, K.; Kasahara, S.; Cheng, J.-G.; Goh, S. K.; Matsuda, Y.
- Abstract
A fundamental issue concerning iron-based superconductivity is the roles of electronic nematicity and magnetism in realising high transition temperature (Tc). To address this issue, FeSe is a key material, as it exhibits a unique pressure phase diagram involving non-magnetic nematic and pressure-induced antiferromagnetic ordered phases. However, as these two phases in FeSe have considerable overlap, how each order affects superconductivity remains perplexing. Here we construct the three-dimensional electronic phase diagram, temperature (T) against pressure (P) and isovalent S-substitution (x), for FeSe1-xSx. By simultaneously tuning chemical and physical pressures, against which the chalcogen height shows a contrasting variation, we achieve a complete separation of nematic and antiferromagnetic phases. In between, an extended non-magnetic tetragonal phase emerges, where Tc shows a striking enhancement. The completed phase diagram uncovers that high-Tc superconductivity lies near both ends of the dome-shaped antiferromagnetic phase, whereas Tc remains low near the nematic critical point.
- Subjects
IRON-based superconductors; SUPERCONDUCTORS; MAGNETISM; TRANSITION temperature; PHASE diagrams; ANTIFERROMAGNETISM; CRITICAL point (Thermodynamics)
- Publication
Nature Communications, 2017, Vol 8, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-017-01277-x