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

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