Kondo-lattice formation in cubic-phase YbCu{sub 5}

Journal Article · Wed Oct 01 04:00:00 EDT 1997 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.56.8103· OSTI ID:632602

Tsujii, N; He, J; Amita, F; Yoshimura, K; Kosuge, K ^[1]; Michor, H; Hilscher, G ^[2]; Goto, T ^[3]

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1. Division of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-01 (Japan)
2. Institute fuer Experimentalphysik, Technische Universitaet Wien, Wiedner Hauptstrasse 8-10, A-1040 Wien (Austria)
3. Institute for Solid State Physics, University of Tokyo, Roppongi-7, Minato-ku, Tokyo 106 (Japan)

The YbCu{sub 5} phase with C15b structure has been prepared by a high-pressure technique, and its physical properties have been investigated. The temperature dependence of magnetic susceptibility, electrical resistivity, and specific heat show Kondo-lattice formation. Furthermore, a heavy Fermi-liquid state without magnetic ordering down to 2.0 K is found to evolve below about 6 K. The electronic specific heat coefficient {gamma} is enhanced to values as large as to 550 mJ/molthinspK{sup 2}. The magnetization measured up to 40 T at 1.6 K has a field dependence which is expected for a Kondo system when the total angular momentum is J{gt}1. All results are in good agreement with the extrapolation of the previous results of YbCu{sub 5{minus}x}Ag{sub x} (0.125{le}x{le}1.0) for x{r_arrow}0. The concentration dependence of characteristic temperatures of YbCu{sub 5{minus}x}Ag{sub x} can be quantitatively explained by the chemical pressure effect within the compressible Kondo model for the full range of Ag concentration ( 0.0{le}x{le}1.0). The origins of Kondo-lattice formation in YbCu{sub 4}Ag and the valence transition in YbCu{sub 4}In are discussed. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 632602
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 13 Vol. 56; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COPPER ALLOYS
ELECTRIC CONDUCTIVITY
FERMI LEVEL
IRIDIUM ALLOYS
KONDO EFFECT
MAGNETIC SUSCEPTIBILITY
MAGNETIZATION
PHYSICAL PROPERTIES
SILVER ALLOYS
SPECIFIC HEAT
VALENCE
YTTRIUM ALLOYS