Volume 98, Number 5, June 2012
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||11 June 2012|
The interplay of electron doping and chemical pressure in Ba(Fe1−yCoy)2(As1−xPx)2
Department Chemie der Ludwig-Maximilians- Universität München - Butenandtstr- 5-13 (Haus D), 81377 München, Germany, EU
Accepted: 14 May 2012
The effects of internal chemical pressure on electron-doped iron arsenide superconductors are studied in the series Ba(Fe1−yCoy)2(As1−xPx)2. Combinations of both dopants induce superconductivity also in areas where only one would not suffice, and can move the system into an overdoped state, while the highest critical temperature is not raised above 31 K in BaFe2(As1−xPx)2. The Tc(x, y) phase diagram contradicts the creation of holes by P-substitution, but supports the finding that P-substitution is charge neutral. Chemical and physical pressure act similarly in Ba(Fe1−yCoy)2(As1−xPx)2, but our data reveal that the most important control parameter is the length of the Fe-As bond and not the unit cell volume. This emphasizes that differences between chemical and physical pressure, which manifest themselves as the non-linear reduction of the Fe-As distance in (As1−xPx)2, are strongly linked to the superconducting properties also in the Co-doped compounds.
PACS: 74.70.Xa – Pnictides and chalcogenides / 74.25.Dw – Superconductivity phase diagrams / 74.62.Dh – Effects of crystal defects, doping and substitution
© EPLA, 2012
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.