SPECIFIC HEAT OF DYSPROSIUM METAL BETWEEN 0.4 AND 4 K

Journal Article · Tue May 15 00:00:00 EDT 1962 · Physical Review (U.S.) Superseded in part by Phys.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.126.1357· OSTI ID:4815924

Lounasmaa, O V; Guenther, R A

The heat capacity of dysprosium has been measured between 0.4 and 4 deg K in a He/sup 3/ cryostat. In this temperature range the specific heat of the metal can be written C/sub p/ = AT/sup 3/ + BT + CT/sup 1/2/ + DT/sup -2/ -- ET/ sup -3/-- FT/sup -4/. The first term is the lattice specific heat, the second the electronic specific heat, the third the magnetic speciflc heat caused by exchange interaction between the electronic spins, and the remaining terms are the nuclear specific heat due to splitting of the nuclear energy levels by the strong magnetic iield of the 4f electrons and by quadrupole coupling. An anomalous contribution to the heat capacity, probably due to the 0.08% oxygen impurity in the sample, was observed between 1.2 and 3.5 deg K. By excluding the measurements in this temperature region the following values were obtained for the constants in the above equation (for speciflc heat in millijoules/mole deg K): B = 9.5 plus or minus 10%, C =9.7 + 10%, D = 26.4 plus or minus 2%. The result A = 0.22 by Dreyfus et al. was adopted and constants E = 1.32 and F = 0.12 were calculated from the available electron paramagnetic resonance data. Considerable disagreement exists in the temperature range from 2 to 4 deg K between measurements of the specific heat of dysprosium by different investigators. It is shown, however, that the discrepancies appear to be in the magnetic speciflc heat only, C varying between 0 and 24. The various values of B are all in good agreement. Our result for D is in excellent accord with the value 26.6 obtained from electron paramagnetic resonance experiments on dilute salts. The magnetic field at the dysprosium nucleus as calculated from the value of D after the effect of quadrupole coupling had been subtracted is 7.1 x 10/sup 6/ gauss, in good agreement with H/sub eff/ = 7.3 x 10/sup 6/ gauss determined for Dy/sup 161/ by Mossbauer techniques. (auth)

• Research Organization: Argonne National Lab., Ill.
• NSA Number: NSA-16-021190
• OSTI ID: 4815924
• Journal Information: Physical Review (U.S.) Superseded in part by Phys.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: 126; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ATOMIC MODELS
COUPLING
CRYOGENICS
DYSPROSIUM
ELECTRIC FIELDS
ELECTRONS
ENERGY LEVELS
HELIUM 3
IMPURITIES
INTERACTIONS
LATTICES
LOW TEMPERATURE
MAGNETIC FIELDS
MAGNETISM
MATHEMATICS
MEASURED VALUES
MOLECULES
NUCLEAR MODELS
NUCLEI
NUMERICALS
OXYGEN
PARAMAGNETISM
PHYSICS
QUADRUPOLES
RESONANCE
SERIES EXPANSION
SPECIFIC HEAT
SPIN
TEMPERATURE