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Title: Continuous control of the superconducting transition temperature from overdoped to underdoped regimes in tetragonal Tl{sub 2}Ba{sub 2}CuO{sub 6+{delta}} thin films

Abstract

Epitaxial superconducting thin films Tl{sub 2}Ba{sub 2}CuO{sub 6+{delta}} (Tl-2201) with a continuous range of doping levels have been synthesized. The films were made by rf magnetron sputtering and two-step postdeposition annealing, and their doping levels were controlled by varying the oxygen content through annealing in flowing argon. By annealing in flowing argon, the as-grown Tl-2201 thin films were changed continuously from the initially overdoped state, through the optimally doped state and then to the underdoped state. The normal state resistivity versus temperature curves of all the underdoped Tl-2201 thin films are convex, whereas those of the overdoped Tl-2201 thin films are all concave. Transmission electron microscopy bright-field images and selected area diffraction patterns of the 58 K underdoped Tl-2201 thin film showed neither twinning bands nor spot splitting associated with an orthorhombic crystal lattice. Therefore, it is concluded that underdoped Tl-2201 thin films are also tetragonal just like all the overdoped and optimally doped Tl-2201 thin films. {copyright} {ital 1997 American Institute of Physics.}

Authors:
;  [1];  [2]
  1. Department of Chemistry and New York State Institute on Superconductivity, Materials Synthesis Laboratory, State University of New York, Buffalo, New York 14260-3000 (United States)
  2. Materials Science Division and Science Technology Center for Superconductivity, Argonne National Laboratory, Argonne, Illinois 60439-4845 (United States)
Publication Date:
OSTI Identifier:
542514
DOE Contract Number:  
W-31-109-ENG-38
Resource Type:
Journal Article
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 71; Journal Issue: 12; Other Information: PBD: Sep 1997
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; THALLIUM OXIDES; TRANSITION TEMPERATURE; BARIUM OXIDES; COPPER OXIDES; SUPERCONDUCTING FILMS; THALLIUM COMPOUNDS; BARIUM COMPOUNDS; ELECTRIC CONDUCTIVITY; TRANSMISSION ELECTRON MICROSCOPY; DIFFUSION; HIGH-TC SUPERCONDUCTORS; DOPED MATERIALS; ANNEALING; STRUCTURAL CHEMICAL ANALYSIS; PHASE DIAGRAMS

Citation Formats

Ren, Z F, Wang, J H, and Miller, D J. Continuous control of the superconducting transition temperature from overdoped to underdoped regimes in tetragonal Tl{sub 2}Ba{sub 2}CuO{sub 6+{delta}} thin films. United States: N. p., 1997. Web. doi:10.1063/1.120010.
Ren, Z F, Wang, J H, & Miller, D J. Continuous control of the superconducting transition temperature from overdoped to underdoped regimes in tetragonal Tl{sub 2}Ba{sub 2}CuO{sub 6+{delta}} thin films. United States. https://doi.org/10.1063/1.120010
Ren, Z F, Wang, J H, and Miller, D J. 1997. "Continuous control of the superconducting transition temperature from overdoped to underdoped regimes in tetragonal Tl{sub 2}Ba{sub 2}CuO{sub 6+{delta}} thin films". United States. https://doi.org/10.1063/1.120010.
@article{osti_542514,
title = {Continuous control of the superconducting transition temperature from overdoped to underdoped regimes in tetragonal Tl{sub 2}Ba{sub 2}CuO{sub 6+{delta}} thin films},
author = {Ren, Z F and Wang, J H and Miller, D J},
abstractNote = {Epitaxial superconducting thin films Tl{sub 2}Ba{sub 2}CuO{sub 6+{delta}} (Tl-2201) with a continuous range of doping levels have been synthesized. The films were made by rf magnetron sputtering and two-step postdeposition annealing, and their doping levels were controlled by varying the oxygen content through annealing in flowing argon. By annealing in flowing argon, the as-grown Tl-2201 thin films were changed continuously from the initially overdoped state, through the optimally doped state and then to the underdoped state. The normal state resistivity versus temperature curves of all the underdoped Tl-2201 thin films are convex, whereas those of the overdoped Tl-2201 thin films are all concave. Transmission electron microscopy bright-field images and selected area diffraction patterns of the 58 K underdoped Tl-2201 thin film showed neither twinning bands nor spot splitting associated with an orthorhombic crystal lattice. Therefore, it is concluded that underdoped Tl-2201 thin films are also tetragonal just like all the overdoped and optimally doped Tl-2201 thin films. {copyright} {ital 1997 American Institute of Physics.}},
doi = {10.1063/1.120010},
url = {https://www.osti.gov/biblio/542514}, journal = {Applied Physics Letters},
number = 12,
volume = 71,
place = {United States},
year = {Mon Sep 01 00:00:00 EDT 1997},
month = {Mon Sep 01 00:00:00 EDT 1997}
}