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- Title
NMR Study on a Pnictide Superconductor LaFeAsOH in a H-Overdoped Regime: Revival of Antiferromagnetic Fluctuations.
- Authors
Fujiwara, N.; Iimura, S.; Matsuishi, S.; Hosono, H.; Yamakawa, Y.; Kontani, H.
- Abstract
An electron-doped high- T pnictide LaFeAsOH is recently known for having double superconducting (SC) domes in the phase diagram. We have performed nuclear magnetic resonance (NMR) measurements in an H-overdoped regime to investigate the second SC dome on a microscopic level. We unexpectedly discovered that the linewidths of both As and H spectra broaden at low temperatures for the 58 and 62.5 % H-doped samples, indicating that the antiferromagnetic (AF) ordering returns in the heavily H-doped regime. The finding itself is rare because an excess carrier doping tends to cause Fermi-liquid behavior in strongly correlated electron systems. We demonstrate that the new AF ordering originates from the nesting between electron pockets.
- Subjects
SEMICONDUCTOR doping; SUPERCONDUCTIVITY; NUCLEAR magnetic resonance; LOW temperatures; FERMI liquids; ELECTRONIC systems
- Publication
Journal of Superconductivity & Novel Magnetism, 2014, Vol 27, Issue 4, p933
- ISSN
1557-1939
- Publication type
Article
- DOI
10.1007/s10948-013-2413-z