Single-Step Synthesis of Sr4V2O6Fe2As2: The Blocking Layer Based Potential Future Superconductor |
| |
Authors: | Anand Pal Arpita Vajpayee R S Meena H Kishan V P S Awana |
| |
Affiliation: | (1) National Physical Laboratory, Dr. K.S. Krishnan Road, New Delhi, 110012, India |
| |
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}CFeAs]?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 |
本文献已被 SpringerLink 等数据库收录! |