2134/17363
Jennifer A. Rodgers
Jennifer A.
Rodgers
George B.S. Penny
George B.S.
Penny
Andrea Marcinkova
Andrea
Marcinkova
Jan-Willem G. Bos
Jan-Willem G.
Bos
Dmitry A. Sokolov
Dmitry A.
Sokolov
Anna Kusmartseva
Anna
Kusmartseva
Andrew D. Huxley
Andrew D.
Huxley
J. Paul Attfield
J. Paul
Attfield
Suppression of the superconducting transition of R FeAsO1-x Fx (R=Tb, Dy, and Ho)
Loughborough University
2015
untagged
Physical Sciences not elsewhere classified
2015-04-24 13:59:27
Journal contribution
https://repository.lboro.ac.uk/articles/journal_contribution/Suppression_of_the_superconducting_transition_of_R_FeAsO1-x_Fx_R_Tb_Dy_and_Ho_/9408986
A suppression of superconductivity in the late rare-earth R FeAsO1-x Fx materials is reported. The maximum critical temperature (Tc) decreases from 51 K for R=Tb to 36 K for HoFeAsO0.9 F0.1, which has been synthesized under 10 GPa pressure. This suppression is driven by a decrease in the Fe-As-Fe angle below an optimum value of 110.6°, as the angle decreases linearly with unit-cell volume (V) across the R FeAsO1-x Fx series. A crossover in electronic structure around this optimum geometry is evidenced by a change in sign of the compositional d Tc /dV, from negative values for previously reported large R materials to positive for HoFeAsO0.9 F0.1. © 2009 The American Physical Society.