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Thermal conductivity in high critical temperature superconductors. Conductividad termica en los superconductores de alta temperatura critica

Miscellaneous:

Abstract

A measuring procedure to obtain the electrical resistivity, thermal conductivity and thermoelectric power of samples of low conductivity has been developed. The setup was designed to allow removal of the sample in clean fashion so that further heat treatments could be performed. The heat equation has been analyzed with time-dependent boundary conditions, with the purpose of developing a dynamic measuring method which avoids the long delays involved in reaching thermal equilibrium above 30K. The developed measuring method allows precise, reliable measurements in a continuous fashion for temperatures above 25K. The same setup is used in a stationary mode at low temperatures. {kappa}(T) has been measured in two ceramic samples of La{sub 2}CuO{sub 4}: the first semiconducting, the other superconducting (SC) as a consequence of an oxygen annealing. Both exhibit strong thermal resistivity due to defects, though lower in the SC, where two maxima are observed and are attributed to an AF ordering: T{sub N}' {approx equal} 40K and T{sub N}'' {approx equal} 240K. A third synthesized sample of CuO exhibits a typical behavior of an insulator, with T{sup 2}.6 at low temperatures, a maximum at 40K and a decrease in T{sup -1} at high temperatures. {kappa}(T) in a SC sample  More>>
Authors:
Publication Date:
Jan 01, 1990
Product Type:
Miscellaneous
Reference Number:
AIX-22-067858; EDB-91-137279
Resource Relation:
Other Information: Tesis (Dr. en Fisica)
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; HIGH-TC SUPERCONDUCTORS; THERMAL CONDUCTIVITY; MEASURING METHODS; COPPER OXIDES; ELECTRIC CONDUCTIVITY; LANTHANUM COMPOUNDS; SEMICONDUCTOR MATERIALS; TEMPERATURE DEPENDENCE; CHALCOGENIDES; COPPER COMPOUNDS; ELECTRICAL PROPERTIES; MATERIALS; OXIDES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; RARE EARTH COMPOUNDS; SUPERCONDUCTORS; THERMODYNAMIC PROPERTIES; TRANSITION ELEMENT COMPOUNDS; 656100* - Condensed Matter Physics- Superconductivity; 360204 - Ceramics, Cermets, & Refractories- Physical Properties
OSTI ID:
5301052
Research Organizations:
Comision Nacional de Energia Atomica, San Carlos de Bariloche (Argentina). Centro Atomico Bariloche; Universidad Nacional de Cuyo, Mendoza (Argentina). Inst. Balseiro
Country of Origin:
Argentina
Language:
Spanish
Availability:
Available from Comision Nacional de Energia Atomica, San Carlos de Bariloche (AR). Centro Atomico Bariloche
Submitting Site:
INIS
Size:
Pages: (144 p)
Announcement Date:
May 13, 2001

Miscellaneous:

Citation Formats

Castello, D J. Thermal conductivity in high critical temperature superconductors. Conductividad termica en los superconductores de alta temperatura critica. Argentina: N. p., 1990. Web.
Castello, D J. Thermal conductivity in high critical temperature superconductors. Conductividad termica en los superconductores de alta temperatura critica. Argentina.
Castello, D J. 1990. "Thermal conductivity in high critical temperature superconductors. Conductividad termica en los superconductores de alta temperatura critica." Argentina.
@misc{etde_5301052,
title = {Thermal conductivity in high critical temperature superconductors. Conductividad termica en los superconductores de alta temperatura critica}
author = {Castello, D J}
abstractNote = {A measuring procedure to obtain the electrical resistivity, thermal conductivity and thermoelectric power of samples of low conductivity has been developed. The setup was designed to allow removal of the sample in clean fashion so that further heat treatments could be performed. The heat equation has been analyzed with time-dependent boundary conditions, with the purpose of developing a dynamic measuring method which avoids the long delays involved in reaching thermal equilibrium above 30K. The developed measuring method allows precise, reliable measurements in a continuous fashion for temperatures above 25K. The same setup is used in a stationary mode at low temperatures. {kappa}(T) has been measured in two ceramic samples of La{sub 2}CuO{sub 4}: the first semiconducting, the other superconducting (SC) as a consequence of an oxygen annealing. Both exhibit strong thermal resistivity due to defects, though lower in the SC, where two maxima are observed and are attributed to an AF ordering: T{sub N}' {approx equal} 40K and T{sub N}'' {approx equal} 240K. A third synthesized sample of CuO exhibits a typical behavior of an insulator, with T{sup 2}.6 at low temperatures, a maximum at 40K and a decrease in T{sup -1} at high temperatures. {kappa}(T) in a SC sample of La{sub 1}.85Sr{sub 1}.15CuO{sub 4} with T{sub c}=35.5K has also been measured. {kappa}(T) is lower than in the previous samples and thus a greater number of defects was inferred.}
place = {Argentina}
year = {1990}
month = {Jan}
}