Unconventional s-Wave Superconductivity in Fe(Se,Te)

被引：452

作者：

Hanaguri, T. ^{[1
,2
]}

Niitaka, S. ^{[1
,2
]}

Kuroki, K. ^{[2
,3
]}

Takagi, H. ^{[1
,2
,4
]}

机构：

[1] RIKEN, Adv Sci Inst, Magnet Mat Lab, Wako, Saitama 3510198, Japan

[2] Japan Sci & Technol Agcy, Transformat Res Project Iron Pnictides, Tokyo 1020075, Japan

[3] Univ Electrocommun, Dept Appl Phys & Chem, Tokyo 1828585, Japan

[4] Univ Tokyo, Dept Adv Mat, Kashiwa, Chiba 2778561, Japan

来源：

SCIENCE | 2010年 / 328卷 / 5977期

关键词：

QUASI-PARTICLE INTERFERENCE;

D O I：

10.1126/science.1187399

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：

The superconducting state is characterized by a pairing of electrons with a superconducting gap on the Fermi surface. In iron-based superconductors, an unconventional pairing state has been argued for theoretically. We used scanning tunneling microscopy on Fe(Se,Te) single crystals to image the quasi-particle scattering interference patterns in the superconducting state. By applying a magnetic field to break the time-reversal symmetry, the relative sign of the superconducting gap can be determined from the magnetic-field dependence of quasi-particle scattering amplitudes. Our results indicate that the sign is reversed between the hole and the electron Fermi-surface pockets (s(+/-)-wave), favoring the unconventional pairing mechanism associated with spin fluctuations.

引用

页码：474 / 476

页数：3

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