Low temperature-high magnetic field heat-capacity studies of weakly and nearly ferromagnetic and mixed-valence rare earth materials

Conference · Thu Jan 01 04:00:00 EST 1981

OSTI ID:5322905

Gschneidner, Jr, K A; Ikeda, K; McMasters, O D

Low temperature heat capacity measurements from 1 to 20 K as a function of magnetic field from 0 to 10 T (100 kOe) have been made on materials which exhibit unusual properties due to spin fluctuations. The spin fluctuating materials studied to date include the itinerant ferromagnet Sc/sub 3/In (1), the mixed valent compound CeSn/sub 3/, and the nearly ferromagnetic materials: RCo/sub 2/ (R = Sc, Y and Lu (2)), Sc and Pd/sub 1-x/Ni/sub x/ (x = 0.005 and 0.01) alloys. In all three types of materials the high magnetic fields quench spin fluctuations. In the nearly ferromagnetic materials and the mixed valent compound this quenching leads to a depression of the electronic specific heat constant of approx. 10% for the former and 23% for the latter - this change is over an order of magnitude larger than has been observed heretofore. The situation for the weakly itinerant ferromagnet Sc/sub 3/In is more complex. Above about twice the Curie temperature, T/sub c/ = 6.0 K, the spin fluctuation contribution to the heat capacity is enhanced by the magnetic field as long as the field is < 5 T, but above 5 T the spin fluctuations are quenched. At or below T/sub c/ the magnetic field always lowers the heat capacity, completely quenching itinerant ferromagnetism in Sc/sub 3/In at 12 T.

• Research Organization: Ames Lab., IA (USA)
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 5322905
• Report Number(s): IS-M-378; CONF-810675-7; ON: DE82016388
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals &amp; Alloys-- Physical Properties
ALLOYS
CERIUM COMPOUNDS
COBALT COMPOUNDS
ELECTRONIC SPECIFIC HEAT
FERROMAGNETIC MATERIALS
INDIUM COMPOUNDS
LOW TEMPERATURE
LUTETIUM COMPOUNDS
MAGNETIC FIELDS
MAGNETIC MATERIALS
MATERIALS
NICKEL ALLOYS
PALLADIUM ALLOYS
PHYSICAL PROPERTIES
PLATINUM METAL ALLOYS
RARE EARTH COMPOUNDS
SCANDIUM ALLOYS
SCANDIUM COMPOUNDS
SPECIFIC HEAT
THERMODYNAMIC PROPERTIES
TIN COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
ULTRALOW TEMPERATURE
YTTRIUM COMPOUNDS