Maximizing T c by tuning nematicity and magnetism in FeSe1−x S x superconductors

K. Matsuura, Y. Mizukami, Y. Arai, Y. Sugimura, N. Maejima, A. Machida, T. Watanuki, T. Fukuda, T. Yajima, Z. Hiroi, K. Y. Yip, Y. C. Chan, Q. Niu, S. Hosoi, K. Ishida, K. Mukasa, S. Kasahara, J.-G. Cheng, S. K. Goh, Y. Matsuda, Y. Uwatoko and T. Shibauchi ()
Additional contact information
K. Matsuura: University of Tokyo
Y. Mizukami: University of Tokyo
Y. Arai: University of Tokyo
Y. Sugimura: University of Tokyo
N. Maejima: Synchrotron Radiation Research Center, National Institutes for Quantum and Radiological Science and Technology
A. Machida: Synchrotron Radiation Research Center, National Institutes for Quantum and Radiological Science and Technology
T. Watanuki: Synchrotron Radiation Research Center, National Institutes for Quantum and Radiological Science and Technology
T. Fukuda: Materials Sciences Research Center, Japan Atomic Energy Agency (SPring-8/JAEA)
T. Yajima: The University of Tokyo
Z. Hiroi: The University of Tokyo
K. Y. Yip: The Chinese University of Hong Kong
Y. C. Chan: The Chinese University of Hong Kong
Q. Niu: The Chinese University of Hong Kong
S. Hosoi: University of Tokyo
K. Ishida: University of Tokyo
K. Mukasa: University of Tokyo
S. Kasahara: Kyoto University
J.-G. Cheng: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences
S. K. Goh: The Chinese University of Hong Kong
Y. Matsuda: Kyoto University
Y. Uwatoko: The University of Tokyo
T. Shibauchi: University of Tokyo

Nature Communications, 2017, vol. 8, issue 1, 1-6

Abstract: Abstract A fundamental issue concerning iron-based superconductivity is the roles of electronic nematicity and magnetism in realising high transition temperature (T c). 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−x S x . 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 T c shows a striking enhancement. The completed phase diagram uncovers that high-T c superconductivity lies near both ends of the dome-shaped antiferromagnetic phase, whereas T c remains low near the nematic critical point.

Date: 2017
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DOI: 10.1038/s41467-017-01277-x

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