SPECIFIC HEAT OF SOME RARE EARTH IRON GARNETS AND YIG AT LOW TEMPERATURES

Journal Article · Sun May 01 04:00:00 EDT 1960 · Journal of Applied Physics (U.S.)

DOI:https://doi.org/10.1063/1.1984600· OSTI ID:4180315

Meyer, H; Harris, A B

Heat capacity measurements of the iron garnets of Y, Gd, Er, Ho, and Yb between 1.4 deg and 20 deg K are presented. Below 5 deg K, the specific heat of YIG can be represented by the sum of a lattice term proportional to T/sup 3/ and the spinwave contribution 2.15 x 10/sup -3/T/sup 3/2/ joules/mole-deg. This last term agrees satisfactorily with that calculated from a spin-wave analysis, in which the exchange interaction coefficients were those derived from Pauthenet's magnetization data. The results of the magnetic specific heat of the rare earth ions could be interpreted in terms of a Weiss molecular field acting on these ions. For Gd/sup 3+/ and Yb/sup 3+/, this field was found to be, respectively, about 3.0 x 10/sup 5/ and 1.5 x 10/sup 5/ oe below 20 deg K, in satisfactory agreement with that derived from Pauthenet's data. (auth)

• Research Organization: Harvard Univ., Cambridge, Mass.
• Sponsoring Organization: USDOE
• NSA Number: NSA-14-017112
• OSTI ID: 4180315
• Journal Information: Journal of Applied Physics (U.S.), Journal Name: Journal of Applied Physics (U.S.) Vol. Vol: 31, Suppl. to No. 5; ISSN JAPIA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

CRYSTALS
ERBIUM
FERRITES
GADOLINIUM
GARNETS
HOLMIUM
IONS
IRON
LATTICES
LOW TEMPERATURE
MAGNETIC FIELDS
MAGNETIC MATERIALS
MATHEMATICS
MEASURED VALUES
MOLECULES
PHYSICS
RARE EARTHS
SPECIFIC HEAT
SPIN
TEMPERATURE
YTTERBIUM
YTTRIUM