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

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Authors
Rodgers, J. A.
Penny, G. B. S.
Marcinkova, A.
Bos, J. W. G.
Sokolov, D. A.
Kusmartseva, A.
Huxley, A. D.
Attfield, J. P.
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Abstract
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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.
Comment: accepted to PRB
Keywords
Condensed Matter - Superconductivity
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