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New Superconductor with Tc > 50 K

New Superconductor with Tc > 50 K

May 23, 2008 (H25). A group of Chinese authors reported in the latest paper published inSuperconductor Science and Technology (SuST) on the recently discovered FeAs-based superconducting compounds.

“Superconductivity at 53.5 K in GdFeAsO(1-δ)” by Z-A Ren et al. reports the fabrication and superconductivity of the iron-based arsenic-oxideGdFeAsO(1-δ) compound with oxygen-deficiency, which has an onset resistivity transition temperature of 53.5 K.  This material has the same crystal structure as the high-Tc ReFeAsO1−δ family (Re = rare earth metal) newly discovered by Kamihara et al[1].  TheGdFeAsO(1-δ) has a further reduced crystal lattice, while the Tc is lower than in the SmFeAsO1−δsystem. 

As a rapid communication, this SuST paper is permanently free for everyone to read at http://www.iop.org/EJ/toc/0953-2048/21/8

temperature

Fig. 1.  The temperature dependence of the dc susceptibility and the differential ZFC curve for the nominal GdFeAsO0.85 sample synthesized by the high-pressure synthesis (HP) method.

[1] Kamihara Y, et al., J. Am. Chem. Soc130 3296 (2008).