TY - JOUR
T1 - Pseudogap behavior of the nuclear spin-lattice relaxation rate in FeSe probed by 77Se-NMR
AU - Shi, Anlu
AU - Arai, Takeshi
AU - Kitagawa, Shunsaku
AU - Yamanaka, Takayoshi
AU - Ishida, Kenji
AU - Böhmer, Anna E.
AU - Meingast, Christoph
AU - Wolf, Thomas
AU - Hirata, Michihiro
AU - Sasaki, Takahiko
N1 - Funding Information:
Acknowledgment We thank Y. Matsuda, T. Shibauchi, S. Kasahara, K. Adachi, R. Ikeda, and Y. Yanase for valuable discussions. This work was partially supported by the Kyoto University LTM center and JSPS KAKENHI (Grant Numbers JP15H05882, JP15H05884, JP15K21732, JP15H05745, and JP17K14339) Part of this work was performed at the High Field Laboratory for Superconducting Materials, Institute for Materials Research, Tohoku University.
Publisher Copyright:
© 2018 The Physical Society of Japan.
PY - 2018
Y1 - 2018
N2 - 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).
AB - 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).
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U2 - 10.7566/JPSJ.87.013704
DO - 10.7566/JPSJ.87.013704
M3 - Article
AN - SCOPUS:85040100776
VL - 87
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - 1
M1 - 013704
ER -