Pseudogap behavior of the nuclear spin-lattice relaxation rate in FeSe probed by 77Se-NMR

Anlu Shi, Takeshi Arai, Shunsaku Kitagawa, Takayoshi Yamanaka, Kenji Ishida, Anna E. Böhmer, Christoph Meingast, Thomas Wolf, Michihiro Hirata, Takahiko Sasaki

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8 Citations (Scopus)

Abstract

We conducted 77Se-nuclear magnetic resonance studies of the iron-based superconductor FeSe in magnetic fields of 0.6 to 19 T to investigate the superconducting and normal-state properties. The nuclear spin-lattice relaxation rate divided by the temperature (T1T)-1 increases below the structural transition temperature Ts but starts to be suppressed below T, well above the superconducting transition temperature Tc(H), resulting in a broad maximum of (T1T)-1 at Tp(H). This is similar to the pseudogap behavior in optimally doped cuprate superconductors. Because T and Tp(H) decrease in the same manner as Tc(H) with increasing H, the pseudogap behavior in FeSe is ascribed to superconducting fluctuations, which presumably originate from the theoretically predicted preformed pair above Tc(H).

Original languageEnglish
Article number013704
Journaljournal of the physical society of japan
Volume87
Issue number1
DOIs
Publication statusPublished - 2018 Jan 1

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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