SPECIFIC HEAT OF LUTETIUM METAL BETWEEN 0.38 AND 4 K

Journal Article · Tue Dec 31 23:00:00 EST 1963 · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D

DOI:https://doi.org/10.1103/PhysRev.133.A219· OSTI ID:4150680

Lounasmaa, O V

The specific heat of lutetium metal was measured in a He/sup 3/ cryostat. Between 0.38 and 4 deg K (in mJ/mole deg K) C/sub p/ == from this curve is, except in a few isolated cases, less than 0.5%. The lattice specific heat corresponds to a Debye characteristic temperature theta = 210 deg K, which is considerably higher than theta 's previously assigned to rare earths. The discrepancy is probably due to difficulties in determining theta accurately for those lanthanides that have large magnetic contributions to C. On the basis of this and other researches it is suggested that for all trivalent rare earths, theta can be calculated by linear interpolation, as a function of the atomic number, between theta = 210 deg K for Lu and theta = 142 deg K for La. An accuracy of plus or minus 5 deg K may be expected. The present value for the coefficient in the electronic specific heat C/sub E/ for Lu and previous measurements on La, Sc, and Y suggest that within plus or minus 7% accuracy one may write for all trivalent lanthanides C/sub E/ = 10.5T. The small T/sup -2/ term in C/sub p/ could be caused by interaction of the nuclear quadrupole moment with the crystalline field gradient, or it may be due to longrange exchange-type coupling between the electronic moments of rare-earth impurities in the Lu sample. If the former interpretation is accepted, the electric field gradient, along the symmetry axis, becomes 2.2 x 10/sup 24/ cm/sup -3/. (auth)

• Research Organization: Argonne National Lab., Ill.
• NSA Number: NSA-18-006115
• OSTI ID: 4150680
• Journal Information: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 133; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ATOMS
DEBYE TEMPERATURE
ELECTRIC CHARGES
ELECTRIC FIELDS
ELECTRIC MOMENTS
ELECTRONS
ERRORS
HELIUM 3
IMPURITIES
INTERACTIONS
IONS
LATTICES
LOW TEMPERATURE
LUTETIUM
MAGNETIC MOMENTS
MEASURED VALUES
METALS
NUCLEI
NUMERICALS
OSCILLATIONS
PHYSICS
QUANTITATIVE ANALYSIS
RARE EARTHS
SPECIFIC HEAT
TEMPERATURE