Low-temperature heat capacity and magnetic properties of the R Ni X sub 2 compounds ( R =La, Ce; X =Si, Ge, Sn)
- Ames Laboratory and Department of Materials Science and Engineering, Iowa State University, Ames, Iowa 50011 (USA)
- Ames Laboratory, Iowa State University, Ames, Iowa 50011 (USA)
Heat-capacity (1.4--80 K) and magnetic-susceptibility (1.5--300 K) measurements were carried out for the series of six ternary intermetallic compounds with {ital R}Ni{ital X}{sub 2} composition ({ital R}=La, Ce and {ital X}=Si, Ge, and Sn). All of the LaNi{ital X}{sub 2} compounds exhibit normal metallic behavior with an electronic specific-heat coefficient in the range 5.2--5.6 mJ/mol K{sup 2} and Debye temperature decreasing from 451 K (LaNiSi{sub 2}) to 258 K (LaNiSn{sub 2}). The CeNi{ital X}{sub 2} compounds display anomalous behaviors. CeNiSi{sub 2} is an intermediate-valence compound at high temperatures with the cerium valence varying from 3.35+ at room temperature to 3.65+ at {ital T}=50 K, and becomes a spin fluctuator at low (around 3.3 K) temperature. The spin fluctuations can be quenched by an external magnetic field of about 5.3 T. Both CeNiGe{sub 2} and CeNiSn{sub 2} undergo two-step antiferromagnetic phase transitions at {ital T}{sub {ital N}}{sup II}=3.9 K and {ital T}{sub {ital N}}{sup I}=3.2 K, which are accompanied by sharp anomalies for all properties studied. The electronic specific constants (in units of mJ/mol Ce K{sup 2}) of the three Ce compounds were 45.3{plus minus}0.6 for CeNiSi{sub 2}, 97.6{plus minus}0.9 for CeNiGe, and 60.8{plus minus}0.7 for CeNiSn{sub 2}.
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 5692209
- Journal Information:
- Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 43:13; ISSN PRBMD; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360104* -- Metals & Alloys-- Physical Properties
360603 -- Materials-- Properties
ALLOY SYSTEMS
ALLOYS
ANGULAR MOMENTUM
ANTIFERROMAGNETISM
CERIUM ALLOYS
DEBYE TEMPERATURE
ELECTRONIC SPECIFIC HEAT
FLUCTUATIONS
GERMANIUM ALLOYS
HIGH TEMPERATURE
INTERMETALLIC COMPOUNDS
LANTHANUM ALLOYS
LOW TEMPERATURE
MAGNETIC FIELDS
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
MAGNETISM
MEDIUM TEMPERATURE
NICKEL ALLOYS
PARTICLE PROPERTIES
PHYSICAL PROPERTIES
RARE EARTH ALLOYS
SILICIDES
SILICON COMPOUNDS
SPECIFIC HEAT
SPIN
TEMPERATURE DEPENDENCE
TERNARY ALLOY SYSTEMS
THERMODYNAMIC PROPERTIES
TIN ALLOYS
ULTRALOW TEMPERATURE
VARIATIONS
VERY LOW TEMPERATURE