Abstract
An electron-doped high-T c pnictide LaFeAsO1−x H x 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 75As and 1H 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.
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References
Iimura, S., et al.: Nat. Commun. 3, 943 (2012)
de la Crruz, C., et al.: Nature 453, 899 (2008)
Luetkens, H., et al.: Nat. Mater. 8, 305 (2009)
Kamihara, Y., et al.: J. Am. Chem. Soc. 130, 3296 (2008)
Nakano, T., et al.: Phys. Rev. B 83, 180508(R) (2011)
Kamihara, Y., et al.: New J. Phys. 12, 033005 (2010)
Huang, Q., et al.: Phys. Rev. Lett. 101, 257003 (2008)
Bao, W., et al.: Phys. Rev. Lett. 102, 247001 (2009)
Yamakawa, Y., et al.: Phys. Rev. B 88, 041106(R) (2013)
Kanamori, J.: Prog. Theor. Phys. 30, 275 (1963)
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Fujiwara, N., Iimura, S., Matsuishi, S. et al. NMR Study on a Pnictide Superconductor LaFeAsO1−x H x in a H-Overdoped Regime: Revival of Antiferromagnetic Fluctuations. J Supercond Nov Magn 27, 933–936 (2014). https://doi.org/10.1007/s10948-013-2413-z
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DOI: https://doi.org/10.1007/s10948-013-2413-z