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Title: Effect of Hf substitutions on the formation and superconductivity of Tl-1212 type phase TlSr{sub 2}(Ca{sub 1−x}Hf{sub x})Cu{sub 2}O{sub 7−δ}

The TlSr{sub 2}(Ca{sub 1−x}Hf{sub x})Cu{sub 2}O{sub 7−δ} (Tl-1212) superconductor for x = 0.0 to 0.4 has been prepared by the solid state reaction method and studied by powder X-ray diffraction method, electrical resistance and scanning electron microscope (SEM). Most of the samples showed the Tl-1212 as the major phase and Tl-1201 as the minor phases. Small amounts of Hf-substitution (x ≤ 0.15 or x ≤ 0.25) maintained the formation of the Tl-1212 phase but larger amounts led to the formation of 1201 and an unknown impurity phase. The resistance versus temperature curve showed metallic behavior for all samples. The resistance versus temperature curves showed onset transition temperature (T{sub c} {sub onset}) between 38 and 47 K for Hf substitution.
Authors:
;  [1]
  1. School of Applied Physics, Universiti Kebangsaan Malaysia 43600 Bangi, Selangor (Malaysia)
Publication Date:
OSTI Identifier:
22262687
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1571; Journal Issue: 1; Conference: 2013 UKM FST postgraduate colloquium, Selangor (Malaysia), 3-4 Jul 2013; Other Information: (c) 2013 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; COPPER OXIDES; SCANNING ELECTRON MICROSCOPY; SOLIDS; SUPERCONDUCTIVITY; SUPERCONDUCTORS; TRANSITION TEMPERATURE; X-RAY DIFFRACTION