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

Autor:	Rodgers, J. A., Penny, G. B. S., Marcinkova, A., Bos, J. W. G., Sokolov, D. A., Kusmartseva, A., Huxley, A. D., Attfield, J. P.
Rok vydání:	2009
Předmět:	Condensed Matter - Superconductivity
Zdroj:	Physical Review B80 052508 (2009)
Druh dokumentu:	Working Paper
Popis:	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
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/0908.1167 Zobrazit plný text záznamu View this record from Arxiv