Investigation of Anderson lattice behavior in Yb1-xLuxAl3

Journal Article · Mon Oct 06 04:00:00 EDT 2003 · Physical Review B

OSTI ID:834633

Bauer, E D ^[1]; Booth, C H; Lawrence, J M; Hundley, M F; Sarrao, J L; Thompson, J D; Riseborough, P S; Ebihara, T

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1. LBNL Library

Measurements of magnetic susceptibility {chi}(T), specific heat C(T), Hall coefficient R{sub H}(T), and Yb valence {nu} = 2 + n{sub f} [f-occupation number n{sub f} (T) determined from Yb L{sub 3} x-ray absorption measurements] were carried out on single crystals of Yb{sub 1-x}Lu{sub x}Al{sub 3}. The low temperature anomalies observed in {chi}(T) and C(T) corresponding to an energy scale T{sub coh} {approx} 40 K in the intermediate valence, Kondo lattice compound YbAl{sub 3} are suppressed by Lu concentrations as small as 5% suggesting these low-T anomalies are extremely sensitive to disorder and, therefore, are a true coherence effect. By comparing the temperature dependence of various physical quantities to the predictions of the Anderson Impurity Model, the slow crossover behavior observed in YbAl{sub 3}, in which the data evolve from a low-temperature coherent, Fermi-liquid regime to a high temperature local moment regime more gradually than predicted by the Anderson Impurity Model, appears to evolve to fast crossover behavior at x {approx} 0.7 where the evolution is more rapid than predicted. These two phenomena found in Yb{sub 1-x}Lu{sub x}Al{sub 3}, i.e., the low-T anomalies and the slow/fast crossover behavior are discussed in relation to recent theories of the Anderson lattice.

• Research Organization: Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (US)
• Sponsoring Organization: USDOE Director. Office of Science. Office of Basic Energy Sciences. Contracts DE-AC03-76SF00098 and DE-FG03-03ER46036 (US)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 834633
• Report Number(s): LBNL--53890
• Journal Information: Physical Review B, Journal Name: Physical Review B Vol. 69
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION
FERMI GAS
MAGNETIC SUSCEPTIBILITY
MONOCRYSTALS
SPECIFIC HEAT
TEMPERATURE DEPENDENCE
VALENCE