Pal, Anand and Vajpayee, Arpita and Meena, R. S. and Kishan, H. and Awana, V. P. S. (2009) Single-Step Synthesis of Sr4V2O6Fe2As2: The Blocking Layer Based Potential Future Superconductor. Journal of Superconductivity and Novel Magnetism, 22 (7). pp. 619-621. ISSN 1557-1947

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Abstract

We report synthesis, structural details and transport measurements on Sr4V2O6Fe2As2. Namely, the stoichiometric amounts of V2O5+1/2xSrO(2)+7/2xSr+2xFeAs 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 1150A degrees 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 P4/nmm space group with lattice parameters a=b=3.925 and c=15.870 . 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){Sr4V2O6}(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.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Springer Verlag.
Subjects:	Physics
Divisions:	UNSPECIFIED
Depositing User:	Ms Neetu Chandra
Date Deposited:	01 Oct 2012 09:49
Last Modified:	01 Oct 2012 09:49
URI:	http://npl.csircentral.net/id/eprint/635

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