Journal
PHYSICAL REVIEW B
Volume 79, Issue 22, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.220512
Keywords
fluctuations in superconductors; Hall effect; iron compounds; lattice constants; magnetic anisotropy; magnetisation; space groups; strontium compounds; superconducting critical field; superconducting materials; superconducting transition temperature; vanadium compounds
Funding
- Natural Science Foundation of China, the Ministry of Science and Technology of China [2006CB601000, 2006CB921802]
- Chinese Academy of Sciences
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The superconductor Sr4V2O6Fe2As2 with transition temperature at 37.2 K was successfully fabricated. It has a layered structure with the space group of p4/nmm and with the lattice constants a=3.9296 A degrees and c=15.6732 A degrees. The observed large diamagnetization signal and zero resistance demonstrated the bulk superconductivity. The broadening of resistive transition was measured under different magnetic fields revealing a rather high upper critical field. The results also suggest a large vortex liquid region that reflects high anisotropy of the system. The Hall-effect measurements revealed dominantly electronlike charge carriers in this material. The superconductivity in the present system may be induced by oxygen deficiency or the multiple valence states of vanadium.
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