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Journal of Superconductivity and Novel Magnetism

, Volume 22, Issue 7, pp 619–621 | Cite as

Single-Step Synthesis of Sr4V2O6Fe2As2: The Blocking Layer Based Potential Future Superconductor

  • Anand Pal
  • Arpita Vajpayee
  • R. S. Meena
  • H. Kishan
  • V. P. S. Awana
Letter

Abstract

We report synthesis, structural details and transport measurements on Sr4V2O6Fe2As2. Namely, the stoichiometric amounts of V2O5+1/2×SrO2+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 P4/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{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.

Keywords

Iron oxy-pnictides Superconductivity Sr4V2O6Fe2As2 Novel synthesis 

PACS

74.10.+v 74.25.Ha 74.70.Ad 

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Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  • Anand Pal
    • 1
  • Arpita Vajpayee
    • 1
  • R. S. Meena
    • 1
  • H. Kishan
    • 1
  • V. P. S. Awana
    • 1
  1. 1.National Physical LaboratoryNew DelhiIndia

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