Synthesis and characterization of FeSe{sub 1−x}Te{sub x} (x=0, 0.5, 1) superconductors

Journal Article · Fri Aug 28 00:00:00 EDT 2015 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.4929202· OSTI ID:22488803

Awana, V. P. S., ^[1]

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1. CSIR-National Physical Laboratory, Dr. K.S. Krishnan Marg, New Delhi-110012 (India)

In this study, FeTe{sub 1-x}Se{sub x} (x=0,0.5,1) samples were prepared by conventional solid state reaction method and investigated by powder XRD, SEM, Raman and resistivity measurement techniques to reveal the effect of tellurium (Te) substitution in FeSe matrix. Rietveld analysis was performed on room temperature recorded, X-ray diffraction (XRD) patterns of pure FeSe, FeTe and FeSe{sub 0.5}Te{sub 0.5} which shows that all the compounds are crystallized in a tetragonal structure. SEM images show the dense surface morphology. Raman spectra recorded in the range from 100 to 700 cm{sup −1} at ambient temperature has been interpreted by P4/nmm space group of the lattice. The variation in intensity and shift in peak positions of some phonon modes has been discussed on the basis of variation in crystalline field effect by substituting Te in FeSe lattice. The resistivity versus temperature curves reveals that FeSe becomes superconductor at 7 K and FeSe{sub 0.5}Te{sub 0.5} shows superconductivity below 14 K while FeTe is non-superconducting compound.

• OSTI ID: 22488803
• Journal Information: AIP Conference Proceedings, Vol. 1675, Issue 1; Conference: AMRP-2015: 4. national conference on advanced materials and radiation physics, Longowal (India), 13-14 Mar 2015; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
AMBIENT TEMPERATURE
IRON SELENIDES
IRON TELLURIDES
MATRIX MATERIALS
MORPHOLOGY
PHONONS
POWDERS
RAMAN SPECTRA
SCANNING ELECTRON MICROSCOPY
SOLIDS
SUPERCONDUCTIVITY
SUPERCONDUCTORS
SURFACES
SYNTHESIS
TELLURIUM
TETRAGONAL LATTICES
X-RAY DIFFRACTION