Synthesis and physical property characterization of LaOBiSe2 and LaO0.5F0.5BiSe2 superconductor

Bulk polycrystalline samples of LaO1−xFxBiSe2 (x ranges from 0 to 0.5) with nominal composition have been successfully synthesized by solid state reaction. Detailed structural analysis shows that LaOBiSe2 crystallizes in a tetragonal structure (P4/nmm) with lattice parameters of a=4.1565(1)Å and c=1...

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Bibliographic Details
Published in:Solid state communications 2015-03, Vol.205, p.14-18
Main Authors: Wu, S.L., Sun, Z.A., Chiang, F.K., Ma, C., Tian, H.F., Zhang, R.X., Zhang, B., Li, J.Q., Yang, H.X.
Format: Article
Language:English
Subjects:
A. Superconductor
B. Preparation
C. Structure
D. Charge density wave
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Summary:Bulk polycrystalline samples of LaO1−xFxBiSe2 (x ranges from 0 to 0.5) with nominal composition have been successfully synthesized by solid state reaction. Detailed structural analysis shows that LaOBiSe2 crystallizes in a tetragonal structure (P4/nmm) with lattice parameters of a=4.1565(1)Å and c=14.1074(3)Å. Experimental results of electrical transport demonstrate that LaOBiSe2 is a bad metal with an evident anomaly at about 120K, while the magnetic susceptibility exhibits an evident anomaly around 120K, suggesting a possible charge density wave (CDW) transition around this temperature. Furthermore, superconductivity is observed in LaO0.5F0.5BiSe2 sample with nominal composition at 3.1K from magnetic and transport measurements. •Bulk polycrystalline samples of LaOBiSe2 have been successfully synthesized by solid state reaction.•Structural analysis shows LaOBiSe2 crystallizes in a tetragonal P4/nmm space group.•Physical property measurement suggests a possible charge density wave transition around 120K.
ISSN:0038-1098
1879-2766
DOI:10.1016/j.ssc.2014.12.016