Thermal conductivity of high-temperature superconductors
Thesis/Dissertation
·
OSTI ID:5401214
The investigation is naturally categorized into two temperature ranges: very low temperatures, {approximately}0.06K < T < {approximately}6K, and in the temperature range 6K < T < 250K. For very low temperatures, a unified description of the thermal conductivity, {kappa}, of high-temperature superconductors is not yet established. An expected T{sup 3} dependence is not obeyed, and deviations from this dependence can be divided into two categories: (1) A power law dependence weaker than cubic, and (2) An anomalous linear temperature dependence for T < {approximately} 0.5K. The possible origin of both phenomena is discussed. For temperatures near the superconducting transition temperature, the behavior of {kappa} for the Bi-O based superconductor, Ba{sub 1{minus}x}K{sub x}BiO{sub 3}, is dramatically different than that of the Cu-O based superconductors. In the Ba{sub 1{minus}x}K{sub x}BiO{sub 3} system, a decrease in {kappa} is observed as the temperature is lowered below {Tc}. In contrast, for CuO-based superconductors, a marked increase in {kappa} is observed as the temperature is lowered below {Tc}. This effect is particularly dramatic for the YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} single crystals, and a theoretical model is presented to describe the data of this system. Finally, it is shown that the thermal conductivity of single-crystal YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} is sensitive to a magnetic field.
- Research Organization:
- Michigan Univ., Ann Arbor, MI (United States)
- OSTI ID:
- 5401214
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
HIGH-TC SUPERCONDUCTORS
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
MAGNETIC FIELDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POTASSIUM COMPOUNDS
POTASSIUM OXIDES
RARE EARTH COMPOUNDS
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
THALLIUM COMPOUNDS
THALLIUM OXIDES
THERMAL CONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
HIGH-TC SUPERCONDUCTORS
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
MAGNETIC FIELDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POTASSIUM COMPOUNDS
POTASSIUM OXIDES
RARE EARTH COMPOUNDS
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
THALLIUM COMPOUNDS
THALLIUM OXIDES
THERMAL CONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES