Superconductivity in Ir-doped LaFe1-xIrxAsO

Details Superconductivity in Ir-doped LaFe1-xIrxAsO Superconductivity in Ir-doped LaFe1-xIrxAsO

2009-04-05

arxiv.org/abs/0904.0772v4

PHYSICAL REVIEW B 80, 054502 (2009)

Physics

Condensed Matter

Superconductivity

21 pages, 9 figures, 1 table (Published version)

Scientific paper

We report the realization of superconductivity by 5d element Ir doping in LaFeAsO, a prototype parent compound of high-temperature iron based superconductors. X-ray diffraction patterns indicate that the material has formed the ZrCuSiAs-type structure with a space group P4/nmm. The systematic evolution of the lattice constants demonstrated that the Fe ions were successfully replaced by the Ir. Both electrical resistance and magnetization measurements show superconductivity up to 11 K in LaFe1-xIrxAsO. The superconducting transitions at different magnetic fields were also measured yielding a slope of -dHc2/dT = 6.7 T / K near Tc, and the upper critical field at zero K is found to be about 55 T. This is the first example of bulk superconductivity induced by replacing the Fe sites with higher d-orbital electrons in FeAs-1111 family, which should add more ingredients to the underlying physics of the iron-based superconductors.

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