Superconductivity in Fluorine-Arsenide Sr_{1-x}La_xFeAsF

Details Superconductivity in Fluorine-Arsenide Sr_{1-x}La_xFeAsF Superconductivity in Fluorine-Arsenide Sr_{1-x}La_xFeAsF

2008-10-14

arxiv.org/abs/0810.2531v3

Europhys. Lett. 85, 17011 (2009).

Physics

Condensed Matter

Superconductivity

11 pages, 4 figures, typos added, references added, and one figure added

Scientific paper

10.1209/0295-5075/85/17011

Since the discovery of superconductivity\cite{1} at 26 K in oxy-pnictide $LaFeAsO_{1-x}F_x$, enormous interests have been stimulated in the fields of condensed matter physics and material sciences. Among the five different structures in this broad type of superconductors\cite{2,3,4,5,6}, the ZrCuSiAs structure has received special attention since the $T_c$ has been quickly promoted to 55-56 K\cite{7,8,9,10,11} in fluorine doped oxy-pnictides REFeAsO (RE = rare earth elements). The superconductivity can also be induced by applying a high pressure to the undoped samples\cite{12,13}. The mechanism of superconductivity in the FeAs-based system remains unclear yet, but it turns out to be clear that any change to the structure or the building blocks will lead to a change of the superconducting transition temperatures. In this Letter, we report the fabrication of the new family of compounds, namely fluorine-arsenides DvFeAsF (Dv = divalent metals) with the ZrCuSiAs structure and with the new building block DvF instead of the REO (both the layers DvF and REO have the combined cation state of "+1"). The undoped parent phase has a Spin-Density-Wave like transition at about 173 K for SrFeAsF, 118 K for CaFeAsF and 153 K for EuFeAsF. By doping electrons into the system the resistivity anomaly associated with this SDW transition is suppressed and superconductivity appears at 32 K in the fluorine-arsenide Sr$_{1-x}$La$_x$FeAsF (x = 0.4). Our discovery here initiates a new method to obtain superconductors in the FeAs-based system.

Affiliated with

Also associated with

No associations

Rating

Superconductivity in Fluorine-Arsenide Sr_{1-x}La_xFeAsF does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Superconductivity in Fluorine-Arsenide Sr_{1-x}La_xFeAsF, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Superconductivity in Fluorine-Arsenide Sr_{1-x}La_xFeAsF will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-592077