As-75-NMR Studies on LaFeAsO1-xFx (x=0.14) under a Pressure of 3 GPa

作者：Tatsumi Kenichiro^*; Fujiwara Naoki; Okada Hironari; Takahashi Hiroki; Kamihara Yoichi; Hirano Masahiro; Hosono Hideo

来源：Journal of the Physical Society of Japan, 2009, 78(2): 023709.

DOI：10.1143/JPSJ.78.023709

• iron-based superconductor
• NMR
• high pressure

As-75-nuclear magnetic resonance (NMR) on an iron (Fe)-based superconductor LaFeAsO1-xFx (x = 0.14) was performed under a pressure of 3 GPa. Enhancement of the superconducting transition temperature. (T-c) was confirmed front the relaxation rate (1/T-1); T-c goes up to 40 K by applying pressure up to 3 GPa. 1/T1T, which is temperature independent just above T-c and gives a measure of the density of states (DOS) at the Fermi energy, enhances by applying pressure. These facts suggest that an increase of the DOS leads to the enhancement of T-c. On the other hand, anomalous behavior of 1/T1T observed at high temperatures is suppressed by applying pressure.

• 出版日期2009-2