TY - JOUR
T1 - Single-step synthesis of Sr 4V 2O 6Fe 2As 2
T2 - The blocking layer based potential future superconductor
AU - Pal, Anand
AU - Vajpayee, Arpita
AU - Meena, R. S.
AU - Kishan, H.
AU - Awana, V. P.S.
N1 - Funding Information:
Acknowledgements The authors thank Prof. Vikram Kumar, Director of the National Physical Laboratory, New Delhi, for his constant support and encouragement. Dr. M. Deepa from NPL is acknowledged for the use of the glove box. Anand Pal and Arpita Vajpayee would like to acknowledge CSIR, India for providing research fellowships. V.P.S. Awana is also thankful to various fruitful discussions in regard to search for new oxy-pnictide superconductors with Prof. G. Baskaran from Mat. Sci. Inst. Chennai, India.
PY - 2009/10
Y1 - 2009/10
N2 - We report synthesis, structural details and transport measurements on Sr 4V 2O 6Fe 2As 2. Namely, the stoichiometric amounts of V 2O 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 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{Sr 4V 2O 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.
AB - We report synthesis, structural details and transport measurements on Sr 4V 2O 6Fe 2As 2. Namely, the stoichiometric amounts of V 2O 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 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{Sr 4V 2O 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.
UR - https://www.scopus.com/pages/publications/69049101940
UR - https://www.scopus.com/pages/publications/69049101940#tab=citedBy
U2 - 10.1007/s10948-009-0494-5
DO - 10.1007/s10948-009-0494-5
M3 - Article
AN - SCOPUS:69049101940
SN - 1557-1939
VL - 22
SP - 619
EP - 621
JO - Journal of Superconductivity and Novel Magnetism
JF - Journal of Superconductivity and Novel Magnetism
IS - 7
ER -