Hybridization and electron doping in the highly-correlated electronic materials Y[sub 1-x]U[sub x]Pd[sub 3] and Y[sub 1-x]Pr[sub x]Ba[sub 2]Cu[sub 3]O[sub 7-[delta]]

Miscellaneous · Wed Jan 01 00:00:00 EST 1992

OSTI ID:7244028

Seaman, C L

Measurements of electrical resistivity [rho](T), magnetic susceptibility [chi](T), and specific heat C(T) for the system Y[sub 1-x]U[sub x]Pd[sub 3] are presented. The data are consistent with nearly localized tetravalent U ions leading to Fermi-level tuning' and competition between single ion Kondo (0 < x [<=] 0.2) and cooperative spin glass-like (0.3 [<=] x [<=] 0.5) behavior. The Kondo behavior is unusual and well described by the two-channel quadrupolar Kondo effect which exhibits non-Fermi liquid behavior. At low temperatures T << T[sub K], where T[sub K] is the Kondo temperature, the electrical resistivity varies nearly linearly with temperature [rho](T)/[rho](O) [approximately] 1 - T/(aT[sub K]), and the electronic specific heat diverges logarithmically [Delta]C/T [approximately] - -(1/T[sub K])lnT with a finite residual T = O entropy S(O) [approx] (R/2)In2. This appears to be the first example of the quadrupolar Kondo effect and two-channel behavior in a dilute alloy with concomitant non-Fermi liquid behavior. The magnetic penetration depth of the high-T[sub c] superconducting system Y[sub 1-x]Pr[sub x]Ba[sub 2]Cu[sub 3]O[sub 6.97] has been measured for 0.05 [<=] x [<=] 0.4 using the technique of transverse-field muon-spin relaxation. The temperature dependence is similar to that of the related compounds YBa[sub 2]Cu[sub 3]O[sub 7-[delta]] with varying oxygen content. The zero-temperature relaxation rate [sigma](0) and T[sub c] both decrease monotonically with x, in a manner similar to that of YBa[sub 2]Cu[sub 3]O[sub 7-[delta]] with increasing [delta]. This observation is consistent with the interpretation that T[sub c] is largely suppressed by means of the annihilation of holes in the conducting CuO[sub 2] planes by the Pr ions. A simple explanation is that Pr is nearly tetravalent in this system. The influence of magnetic pair breaking, finite mean free path, and correlation with results for other high-Tc superconductors are discussed.

• Research Organization: California Univ., San Diego, La Jolla, CA (United States)
• OSTI ID: 7244028
• Resource Relation: Other Information: Thesis (Ph.D.)
• Country of Publication: United States
• Language: English

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36 MATERIALS SCIENCE
HIGH-TC SUPERCONDUCTORS
MAGNETIC PROPERTIES
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ELECTRICAL PROPERTIES
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YTTRIUM COMPOUNDS
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