Abstract
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.
| Original language | English |
|---|---|
| Article number | 054414 |
| Journal | Physical Review B |
| Volume | 95 |
| Issue number | 5 |
| DOIs | |
| State | Published - Feb 10 2017 |
Funding
X.K. acknowledges support from the start-up funds at Michigan State University. The work at Tulane (i.e., single crystal growth and characterization) is supported by the U.S. Department of Energy under EPSCoR Grant No. DE-SC0012432 with additional support from the Louisiana Board of Regents. Research conducted at ORNL's High Flux Isotope Reactor was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy. B.Q. is supported by National Natural Science Foundation of China (Grants No. 11374043, No. 11174043, and No. 51371004), Natural Science Foundation of Jiangsu Educational Department (Grant No. 13KJA430001), and six-talent peak of Jiangsu Province (Grants No. 2011-XCL-022 and No. 2012-XCL-036). W.K. acknowledges support from National Natural Science Foundation of China (Grant No. 11447601) and Ministry of Science and Technology (Grants No. 2016YFA0300500 and No. 2016YFA0300501).