Single-Step Synthesis of Sr4V2O6Fe2As2: The Blocking Layer Based Potential Future Superconductor
We report synthesis, structural details and transport measurements on Sr 4 V 2 O 6 Fe 2 As 2 . Namely, the stoichiometric amounts of V 2 O 5 +1/2×SrO 2 +7/2×Sr+2×FeAs are weighed mixed, ground thoroughly and palletized in rectangular form in a glove box in high purity Ar atmosphere. The pellet is fu...
Saved in:
Published in | Journal of superconductivity and novel magnetism Vol. 22; no. 7; pp. 619 - 621 |
---|---|
Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
Boston
Springer US
01.10.2009
Springer |
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | We report synthesis, structural details and transport measurements on Sr
4
V
2
O
6
Fe
2
As
2
. Namely, the stoichiometric amounts of V
2
O
5
+1/2×SrO
2
+7/2×Sr+2×FeAs are weighed mixed, ground thoroughly and palletized in rectangular form in a glove box in high purity Ar atmosphere. The pellet is further sealed in an evacuated (10
−5
torr) quartz tube and put for heat treatments at 750 and 1150°C in a single step for 12 and 36 hours respectively. Finally the quartz ampoule is allowed to cool naturally to room temperature. The as-synthesized sample is black in color. The compound crystallized in
P
4/
nmm
space group with lattice parameters
a
=
b
=3.925 Å and
c
=15.870 Å. Also seen are some small impurity lines. The compound did not exhibit superconductivity but instead a spin density wave (
SDW
) like metallic step at around 175 K is seen in
R
(
T
) measurements. Principally in [FeAs]
−1
{Sr
4
V
2
O
6
}
C
[FeAs]
−1
the net value of blocking layer charge C must be either less or more than 2, to let it be electron or hole type superconductor respectively. Efforts are under way to achieve superconductivity in the studied system. |
---|---|
Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 |
ISSN: | 1557-1939 1557-1947 |
DOI: | 10.1007/s10948-009-0494-5 |