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Title: Structural and superconducting features of Tl-1223 prepared at ambient pressure

This study provides an account of the bulk preparation of TlBa 2Ca 2Cu 3O 9-δ (Tl-1223) superconductor at ambient pressure, and the Tc features under thermal-annealing conditions. The ‘as-prepared’ Tl-1223 (Tc =106 K) presents a significantly higher T c = 125 K after annealing the polycrystalline material in either flowing Ar+4% H 2, or N 2 gases. In order to understand the fundamental reasons for a particular Tc, we refined the average bulk structures using powder X-ray diffraction data. Although Ar+4%H2 annealed Tl- 1223 shows an increased ‘c’ lattice parameter, it shrinks by 0.03% (approximately unchanged) upon N2 anneal. Due to such indeterminate conclusions on the average structural changes, local structures were investigated at using aberration-corrected scanning-transmission electron microscopy technique. Similar compositional changes in the atomic arrangements of both annealed-samples of Tl-1223 were detected in which the plane containing Ca atomic layer gives a non-uniform contrast, due to substitution of some heavier Tl. In this report, extensive bulk properties are summarized through temperature-dependent resistivity, and shielding and Meissner fractions of magnetic susceptibility results; the bulk and local structures are investigated to correlate to properties.
Authors:
 [1] ;  [1] ;  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Superconductor Science and Technology
Additional Journal Information:
Journal Volume: 28; Journal Issue: 11; Journal ID: ISSN 0953-2048
Publisher:
IOP Publishing
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1286901

Shipra, Fnu, Idrobo Tapia, Juan Carlos, and Sefat, Athena Safa. Structural and superconducting features of Tl-1223 prepared at ambient pressure. United States: N. p., Web. doi:10.1088/0953-2048/28/11/115006.
Shipra, Fnu, Idrobo Tapia, Juan Carlos, & Sefat, Athena Safa. Structural and superconducting features of Tl-1223 prepared at ambient pressure. United States. doi:10.1088/0953-2048/28/11/115006.
Shipra, Fnu, Idrobo Tapia, Juan Carlos, and Sefat, Athena Safa. 2015. "Structural and superconducting features of Tl-1223 prepared at ambient pressure". United States. doi:10.1088/0953-2048/28/11/115006. https://www.osti.gov/servlets/purl/1286901.
@article{osti_1286901,
title = {Structural and superconducting features of Tl-1223 prepared at ambient pressure},
author = {Shipra, Fnu and Idrobo Tapia, Juan Carlos and Sefat, Athena Safa},
abstractNote = {This study provides an account of the bulk preparation of TlBa2Ca2Cu3O9-δ (Tl-1223) superconductor at ambient pressure, and the Tc features under thermal-annealing conditions. The ‘as-prepared’ Tl-1223 (Tc =106 K) presents a significantly higher Tc = 125 K after annealing the polycrystalline material in either flowing Ar+4% H2, or N2 gases. In order to understand the fundamental reasons for a particular Tc, we refined the average bulk structures using powder X-ray diffraction data. Although Ar+4%H2 annealed Tl- 1223 shows an increased ‘c’ lattice parameter, it shrinks by 0.03% (approximately unchanged) upon N2 anneal. Due to such indeterminate conclusions on the average structural changes, local structures were investigated at using aberration-corrected scanning-transmission electron microscopy technique. Similar compositional changes in the atomic arrangements of both annealed-samples of Tl-1223 were detected in which the plane containing Ca atomic layer gives a non-uniform contrast, due to substitution of some heavier Tl. In this report, extensive bulk properties are summarized through temperature-dependent resistivity, and shielding and Meissner fractions of magnetic susceptibility results; the bulk and local structures are investigated to correlate to properties.},
doi = {10.1088/0953-2048/28/11/115006},
journal = {Superconductor Science and Technology},
number = 11,
volume = 28,
place = {United States},
year = {2015},
month = {9}
}