Suppression of the superconducting transition of RFeAsO1−xFx (R=Tb, Dy, and Ho)
Jennifer A. Rodgers, George B. S. Penny, Andrea Marcinkova, Jan-Willem G. Bos, Dmitry A. Sokolov, Anna Kusmartseva, Andrew D. Huxley, J. Paul Attfield
DOI 10.1103/PhysRevB.80.052508 · Physical Review B
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Abstract
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 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 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| HoFeAsO0.9F0.1 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 36.2 | Pressure not reported | onset |
| HoFeAsO0.9F0.1 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 36.2 | Pressure not reported | zero_resistance |
| TbFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 51 | Pressure not reported | unknown |
| DyFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 45 | Pressure not reported | unknown |
| LaFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 26 | Pressure not reported | unknown |
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