Details

Autor(en) / Beteiligte

• 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.
• Uwatoko, Y.
• Shibauchi, T.

Titel

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

Ist Teil von

• Nature communications, 2017-10, Vol.8 (1), p.1-6, Article 1143

Ort / Verlag

London: Nature Publishing Group

Erscheinungsjahr

2017

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• 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 FeSe 1− 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.