75As-NMR studies on La FeAsO1-xFx (x=0.14) under a pressure of 3GPa

Details 75As-NMR studies on La FeAsO1-xFx (x=0.14) under a pressure of 3GPa 75As-NMR studies on La FeAsO1-xFx (x=0.14) under a pressure of 3GPa

2008-11-22

arxiv.org/abs/0811.3672v3

Journal of Phys.Soc.Jpn 78 (2009) 023709

Physics

Condensed Matter

Superconductivity

4pages, 5figures. Scheduled to appear in Journal of Phys. Soc. Jpn VoL.78 No.2 (2009)

Scientific paper

10.1143/JPSJ.78.023709

75As-nuclear magnetic resonance (NMR) on an iron-based superconductor LaFeAsO1-xFx (x=0.14) was performed under a pressure of 3GPa. Enhancement of superconducting transition temperature Tc was confirmed from the relaxation rate 1/T1; Tc goes up to 40K by applying pressure up to 3GPa. 1/T1T, which is temperature independent just above Tc and gives a measure of the density of states (DOS) at the Fermi energy, enhances by applying pressure. These facts suggest that the increase of the DOS leads to the enhancement of Tc. On the other hand, anomalous behavior of 1/T1T observed at high temperatures is suppressed by applying pressure.

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