G-type magnetic order in ferropnictide CuxFe1−yAs induced by hole doping on As sites

• Published in: Physical review. B 2017-02, Vol.95 (5), p.054414
• Main Authors: Zou, T, Lee, C Lee, Tian, W, Cao, H B, Zhu, M, Qian, B, delaCruz, C R, Ku, W, Mao, Z Q, Ke, X
• Format: Article
• Language: English
• Subjects: Antiferromagnetism; CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Correlation; Cuprates; Doping; Fermions; High temperature superconductors; Magnetic susceptibility; Magnetic texture; Magnetization measurements; Neutron diffraction; Organic chemistry; Organic superconductors; Stripes; Superconductivity; Unconventional superconductors; X-ray diffraction
• ISSN: 2469-9950; 2469-9969
• DOI: 10.1103/PhysRevB.95.054414

Strong antiferromagnetic (AFM) correlation has long been postulated to be closely related to the occurrence of unconventional high-temperature superconductivity observed in the cuprates, heavy fermions, and organic superconductors. The recently discovered Fe-based superconductors add another interesting member to the list. However, insufficient attention has been paid to the versatile nature of the magnetic correlation in these materials: some showing stripe (C-type) order, others double stripe (E-type) or block AFM order instead, implying potentially richer structures of the superconducting order. Here we report the observation of yet another AFM correlation in the family: a G-type AFM order as seen in the high-Tc cuprates, in CuxFe1−yAs compounds isostructural to the LiFeAs superconductor. This study not only sheds light on the underlying mechanism of the rich magnetic correlations in the Fe-based superconductors, but also suggests the possibility of realizing a distinct pairing symmetry upon chemical doping or applying pressure.