Two distinct superconducting pairing states divided by the nematic end point in FeSe1-xSx

被引：87

作者：

Hanaguri, Tetsuo ^{[1
]}

Iwaya, Katsuya ^{[1
]}

Kohsaka, Yuhki ^{[1
]}

Machida, Tadashi ^{[1
]}

Watashige, Tatsuya ^{[2
,4
]}

Kasahara, Shigeru ^{[2
]}

Shibauchi, Takasada ^{[3
]}

Matsuda, Yuji ^{[2
]}

机构：

[1] RIKEN, Ctr Emergent Matter Sci, Wako, Saitama 3510198, Japan

[2] Kyoto Univ, Dept Phys, Kyoto 6068502, Japan

[3] Univ Tokyo, Dept Adv Mat Sci, Chiba 2778561, Japan

[4] TOYO Corp, Chuo Ku, Tokyo 1038284, Japan

来源：

SCIENCE ADVANCES | 2018年 / 4卷 / 05期

关键词：

ELECTRONIC NEMATICITY; TRANSITION; PHASE; ORDER; FESE;

D O I：

10.1126/sciadv.aar6419

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Unconventional superconductivity often competes or coexists with other electronic orders. In iron-based superconductors, a central issue has been the relationship between superconductivity and electronic nematicity, spontaneous breaking of the lattice rotational symmetry. Using spectroscopic-imaging scanning tunneling microscopy, we simultaneously investigated the electronic structure and the superconducting gap in FeSe1-xSx, where the nematicity diminishes above the nematic end point (NEP) at x = 0.17. The nematic band structure appears as anisotropic quasiparticleinterference patterns that gradually become isotropic with increasing x without anomalies at the NEP. By contrast, the superconducting gap, which is intact in the nematic phase, discontinuously shrinks above the NEP. This implies that the presence or absence of nematicity results in two distinct pairing states, whereas the pairing interaction is insensitive to the strength of nematicity.

引用

页数：7