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arXiv 0811.3672cond-mat.supr-concond-mat.str-el
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3GPa压力下La FeAsO1-xFx(x=0.14)的~(75)As- NMR研究

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

K. Tatsumi, N. Fujiwara, H. Okada, H. Takahashi, Y. Kamihara, M. Hirano, H. Hosono

摘要:

在3GPa压力下对铁基超导体LaFeAsO_(1-x)Fx(x=0.14)进行了~(75)As-核磁共振(NMR)研究。从弛豫速率1/T1证实了超导转变温度Tc的提高,当压力达到3GPa时,Tc可达40 K。1/T1 T,其在Tc之上与温度无关,并且给出了费米能量下的态密度(DOS)的量度,通过施加压力而增强。这些事实表明,DOS的增加导致Tc的提高。另一方面,通过施加压力,在高温下观察到的1/T1 T的异常行为被抑制。

英文摘要:

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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