Scaling phenomena in the Kondo lattice system CeCu/sub 2/Si/sub 2/ and its alloys with CeAu/sub 2/Si/sub 2/ and CeNi/sub 2/Si/sub 2/
Thesis/Dissertation
·
OSTI ID:6088000
The systems Ce(Cu/sub 1-x/Me/sub x/)/sub 2/Si/sub 2/)(Me = Au, Ni), were investigated using probes including magnetic susceptibility, electrical resistivity and L/sub 111/ absorption edge spectra. The primary interest of these studies was in phenomena that result form 4f instabilities in Kondo lattice systems. Of particular interest was the study of the interplay of crystalline electric field (CEF) effects and Kondo fluctuations and the investigation of scaling phenomena associated with the 4f instability. CeCu/sub 2/Si/sub 2/ is an interesting Kondo lattice system. It has a non-integral valence and a superconducting ground state with a T/sub c/ of 0.5 K. The effective electron mass in this system is >200 times the free electron mass. The properties of CeCu/sub 2/Si/sub 2/ are also complicated by CEF effects. Alloying with Ni causes a linear increase in the Ce valence from approx.3.06 in CeCu/sub 2/Si/sub 2/ to approx.3.20 in CeNi/sub 2/Si/sub 2/. The increased hybridization associated with the increased valence washes out the crystal field structure in these systems. Alloying with Au stabilizes the Ce moment as well as stabilizing the Ce valence at +3. At or above approx.50% Au the system develops an antiferromagnetically ordered ground state.
- Research Organization:
- Polytechnic Inst. of Brooklyn, NY (USA)
- OSTI ID:
- 6088000
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
360104 -- Metals & Alloys-- Physical Properties
ALLOYS
CERIUM ALLOYS
COPPER ALLOYS
CRYSTAL STRUCTURE
ELECTRIC FIELDS
GOLD ADDITIONS
GOLD ALLOYS
KONDO EFFECT
METALLURGICAL EFFECTS
NICKEL ADDITIONS
NICKEL ALLOYS
RARE EARTH ALLOYS
SCALING LAWS
SILICON ALLOYS
360102* -- Metals & Alloys-- Structure & Phase Studies
360104 -- Metals & Alloys-- Physical Properties
ALLOYS
CERIUM ALLOYS
COPPER ALLOYS
CRYSTAL STRUCTURE
ELECTRIC FIELDS
GOLD ADDITIONS
GOLD ALLOYS
KONDO EFFECT
METALLURGICAL EFFECTS
NICKEL ADDITIONS
NICKEL ALLOYS
RARE EARTH ALLOYS
SCALING LAWS
SILICON ALLOYS