skip to main content

SciTech ConnectSciTech Connect

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

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.
Authors:
;  [1] ;  [2]
  1. Department of Physics, Jamia Millia Islamia, New Delhi-110025 (India)
  2. CSIR-National Physical Laboratory, Dr. K.S. Krishnan Marg, New Delhi-110012 (India)
Publication Date:
OSTI Identifier:
22488803
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1675; Journal 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)
Country of Publication:
United States
Language:
English
Subject:
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