Impurity effects on superconductivity and magnetism in heavy electron and high-transition-temperature copper oxide compounds
The effects of impurities on the superconducting and magnetic properties of the heavy electron UBe{sub 13} and URu{sub 2}Si{sub 2} compounds and the high transition temperature YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} material were studied to get a better understanding of their exceptional superconducting and magnetic ground state properties. This investigation was carried out by means of low temperature ac magnetic susceptibility {chi}{sub ac}(T), upper critical magnetic field H{sub c2}(T), electrical resistivity {rho}(T), dc magnetic susceptibility {chi}(T), and specific heat C(T). The influence of pressure P on the superconducting transition temperature {Tc} has been determined for the (U{sub 1-x} Th{sub x}) Be{sub 13} system. The phase diagram of {Tc}({chi}) for P = 10 kbar shows two distinct regions of superconductivity. The temperature T dependence of the upper critical magnetic field H{sub c2} was subsequently measured for two compositions (x=0 and 0.029) of (U{sub 1-x} Th{sub x}) Be{sub 13} doped with various concentration of Gd. These results are consistent with singlet superconductivity in UBe{sub 13} and either strong spin orbit scattering or triplet spin pairing (U{sub 0.97} Th{sub 0.03}) Be{sub 13}. The moderately heavy electron compound URu{sub 2}Si{sub 2} exhibits a spin density wave transition at T{sub o} = 17.5 K followed by superconductivity at {Tc} < 1.5 K. The superconducting transition temperature {Tc} of Y{sub 1-x} Pr{sub x}Ba{sub 2}Cu{sub 3}O{sub 7-{delta}} (0 {le} x {le} 1) and Y{sub 1-x}Na{sub x}Ba{sub 2}Cu{sub 3}O{sub 7-{delta}} (0 {le} x {le} 0.5) systems decrease monotonically with concentration x.
- Research Organization:
- California Univ., San Diego, CA (USA)
- OSTI ID:
- 5946979
- Country of Publication:
- United States
- Language:
- English
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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ACTINIDE ALLOYS
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
BARIUM COMPOUNDS
BARIUM OXIDES
BERYLLIUM ALLOYS
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL FIELD
DIAGRAMS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
IMPURITIES
MAGNETIC FIELDS
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
OXIDES
OXYGEN COMPOUNDS
PHASE DIAGRAMS
PHYSICAL PROPERTIES
PLATINUM METAL ALLOYS
PRASEODYMIUM COMPOUNDS
PRASEODYMIUM OXIDES
PRESSURE EFFECTS
RARE EARTH COMPOUNDS
RUTHENIUM ALLOYS
SILICON ALLOYS
SODIUM COMPOUNDS
SODIUM OXIDES
SPECIFIC HEAT
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
URANIUM ALLOYS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES