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 · Tue Jan 01 00:00:00 EST 1985

OSTI ID:6088000

Edwards, M A

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
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CERIUM ALLOYS
CRYSTAL STRUCTURE
COPPER ALLOYS
GOLD ADDITIONS
METALLURGICAL EFFECTS
NICKEL ADDITIONS
SILICON ALLOYS
ELECTRIC FIELDS
KONDO EFFECT
SCALING LAWS
ALLOYS
GOLD ALLOYS
NICKEL ALLOYS
RARE EARTH ALLOYS
360102* - Metals & Alloys- Structure & Phase Studies
360104 - Metals & Alloys- Physical Properties