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Title: Impurity effects on superconductivity and magnetism in heavy electron and high-transition-temperature copper oxide compounds

Abstract

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 bymore » 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.« less

Authors:
Publication Date:
Research Org.:
California Univ., San Diego, CA (USA)
OSTI Identifier:
5946979
Resource Type:
Miscellaneous
Resource Relation:
Other Information: Thesis (Ph. D.)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BARIUM OXIDES; PHYSICAL PROPERTIES; BERYLLIUM ALLOYS; COPPER OXIDES; PRASEODYMIUM OXIDES; RUTHENIUM ALLOYS; SILICON ALLOYS; SODIUM OXIDES; URANIUM ALLOYS; YTTRIUM OXIDES; CRITICAL FIELD; ELECTRIC CONDUCTIVITY; IMPURITIES; MAGNETIC PROPERTIES; MAGNETIC SUSCEPTIBILITY; PHASE DIAGRAMS; PRESSURE EFFECTS; SPECIFIC HEAT; SUPERCONDUCTIVITY; TRANSITION TEMPERATURE; ACTINIDE ALLOYS; ALKALI METAL COMPOUNDS; ALKALINE EARTH METAL COMPOUNDS; ALLOYS; BARIUM COMPOUNDS; CHALCOGENIDES; COPPER COMPOUNDS; DIAGRAMS; ELECTRICAL PROPERTIES; MAGNETIC FIELDS; OXIDES; OXYGEN COMPOUNDS; PLATINUM METAL ALLOYS; PRASEODYMIUM COMPOUNDS; RARE EARTH COMPOUNDS; SODIUM COMPOUNDS; THERMODYNAMIC PROPERTIES; TRANSITION ELEMENT COMPOUNDS; YTTRIUM COMPOUNDS; 360104* - Metals & Alloys- Physical Properties; 360204 - Ceramics, Cermets, & Refractories- Physical Properties; 656100 - Condensed Matter Physics- Superconductivity

Citation Formats

Dalichaouch, Y. Impurity effects on superconductivity and magnetism in heavy electron and high-transition-temperature copper oxide compounds. United States: N. p., 1988. Web.
Dalichaouch, Y. Impurity effects on superconductivity and magnetism in heavy electron and high-transition-temperature copper oxide compounds. United States.
Dalichaouch, Y. Fri . "Impurity effects on superconductivity and magnetism in heavy electron and high-transition-temperature copper oxide compounds". United States.
@article{osti_5946979,
title = {Impurity effects on superconductivity and magnetism in heavy electron and high-transition-temperature copper oxide compounds},
author = {Dalichaouch, Y},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1988},
month = {1}
}

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