论文信息 - Pressure effect on superconductivity of iron-based arsenic-oxide ReFeAsO0.85 (Re=Sm and Nd)

Pressure effect on superconductivity of iron-based arsenic-oxide ReFeAsO0.85 (Re=Sm and Nd)

Here we report pressure effects on the superconducting transition temperature (Tc) of the ReFeAsO0.85 (Re=Sm and Nd) system without fluorine doping. In situ measurements under high pressure showed that Tc of the two compounds decreases monotonously over the pressure range investigated. The pressure coefficients dTc/dP in SmFeAsO0.85 and NdFeAsO0.85 were different, revealing the important influence of the deformation in layers on Tc. Theoretical calculations suggested that the electron density of states decreases with increasing pressure, following the same trend of experimental data.

[1] Z. Ren,et al. Magnetic measurements and 57Fe Mossbauer spectroscopy in oxygen deficient SmFeAsO0.85 , 2008, 0805.2794.

[2] Z. Ren,et al. Superconductivity and phase diagram in iron-based arsenic-oxides ReFeAsO1−δ (Re = rare-earth metal) without fluorine doping , 2008, 0804.2582.

[3] Technology of China,et al. Pressure Effects on the Superconducting and Spin-Density-Wave States of the Newly Discovered Sm(O1-xFx)FeAs , 2008, 0804.1582.

[4] Wei Lu,et al. Superconductivity in the iron-based F-doped layered quaternary compound Nd[O1 − x Fx]FeAs , 2008, 0803.4234.

[5] Gang Li,et al. Superconductivity at 41 K and its competition with spin-density-wave instability in layered CeO1-xFxFeAs. , 2008, Physical review letters.

[6] Yuan Yao,et al. Doping-dependent phase diagram of LaOMAs (M=V–Cu) and electron-type superconductivity near ferromagnetic instability , 2008, 0803.1282.