Detection of Antiferromagnetic Ordering in Heavily DopedLaFeAsO1−xHxPnictide Superconductors Using Nuclear-Magnetic-Resonance Techniques

N. Fujiwara, S. Tsutsumi, S. Iimura, S. Matsuishi, H. Hosono, Y. Yamakawa, H. Kontani
2013 Physical Review Letters  
We studied double superconducting (SC) domes in LaFeAsO1-xHx by using 75As- and 1H-nuclear magnetic resonance techniques, and unexpectedly discovered that a new antiferromagnetic (AF) phase follows the double SC domes on further H doping, forming a symmetric alignment of AF and SC phases in the electronic phase diagram. We demonstrated that the new AF ordering originates from the nesting between electron pockets, unlike the nesting between electron and hole pockets as seen in the majority of
more » ... the majority of undoped pnictides. The new AF ordering is derived from the features common to high-Tc pnictides: however, it has not been reported so far for other high-Tc pnictides because of their poor electron doping capability.
doi:10.1103/physrevlett.111.097002 pmid:24033063 fatcat:ktyzzv7zmbenxgpsbgf2ut4e2m