Kondo-lattice behavior and multiple characteristic temperatures in CeIr{sub 2}Ge{sub 2}
- Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400005 (India)
- Universitaet-GH Paderborn, Fachbereich Physik, D-33095 Paderborn (Germany)
The results of electrical-resistivity {rho} measurements (1.4{endash}300 K) on the alloys, Ce{sub 1{minus}x}La{sub x}Ir{sub 2}Ge{sub 2} (0{le}x{le}1), CeIr{sub 2{minus}x}(Rh,Pt){sub x}Ge{sub 2} (x=0.2 and 0.4), and CeIr{sub 2}Ge{sub 2{minus}x}(Si,Sn){sub x} (x=0.2 and 0.4), are reported in order to understand the Kondo effect in CeIr{sub 2}Ge{sub 2}. There is a significant decrease in {rho} as the temperature is lowered from 100 to 4.2 K for x = 0.0. This feature disappears for a small replacement of Ce by La (x = 0.3), thereby resulting in a single-ion Kondo effect for higher values of x. This finding establishes that the temperature T{sub coh}, characterizing the coherent scattering among the Kondo centers for x=0 is as large as about 100 K. The coherent scattering is not destroyed by small substitutions at the Ir or Ge site. The observed sensitivity of this coherence effect to a small disruption of Ce sublattice periodicity alone by La substitution is uncommon among trivalent Ce alloys. Such a large T{sub coh} value enables us to emphasize the need to invoke three characteristic temperatures for nonmagnetic Kondo lattices. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 450384
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 6 Vol. 55; ISSN 0163-1829; ISSN PRBMDO
- Country of Publication:
- United States
- Language:
- English
Similar Records
Effect of pressure on the reentrant superconductor--normal-metal phase boundaries of the (La[sub 1[minus][ital n]]Ce[sub [ital n]])Al[sub 2] and (La[sub 1[minus][ital x]]Th[sub [ital x]])[sub 1[minus][ital n]]Ce[sub [ital n]] Kondo systems
Lattice, Ce-L{sub 3}valence, transport, and magnetic results on mixed-valent/Kondo system Ce{sub 1{minus}x}La{sub x}Mn{sub 2}Si{sub 2}
Related Subjects
CERIUM ALLOYS
ELECTRIC CONDUCTIVITY
ELECTRONIC STRUCTURE
GERMANIUM ALLOYS
GRAIN BOUNDARIES
IRIDIUM ALLOYS
KONDO EFFECT
LANTHANUM ALLOYS
PLATINUM ALLOYS
QUATERNARY ALLOY SYSTEMS
RHODIUM ALLOYS
SILICON ALLOYS
TEMPERATURE RANGE 0000-0013 K
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0065-0273 K
TIN ALLOYS