Suppression of the Superconducting Transition in RFeAsO1-xFx for R = Tb, Dy, Ho

Details Suppression of the Superconducting Transition in RFeAsO1-xFx for R = Tb, Dy, Ho Suppression of the Superconducting Transition in RFeAsO1-xFx for R = Tb, Dy, Ho

2009-08-08

arxiv.org/abs/0908.1167v1

Physical Review B80 052508 (2009)

Physics

Condensed Matter

Superconductivity

accepted to PRB

Scientific paper

A suppression of superconductivity in the late rare earth RFeAsO1-xFx materials is reported. The maximum critical temperature (Tc) decreases from 51 K for R = Tb to 36 K for HoFeAsO0.9F0.1, which has been synthesised under 10 GPa pressure. This suppression is driven by a decrease in the Fe-As-Fe angle below an optimimum value of 110.6 degrees, as the angle decreases linearly with unit cell volume (V) across the RFeAsO1-xFx series. A crossover in electronic structure around this optimum geometry is evidenced by a change in sign of the compositional dTc/dV, from negative values for previously reported large R materials to positive for HoFeAsO0.9F0.1.

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