SPECIFIC HEAT OF SAMARIUM METAL BETWEEN 0.4 AND 4 K
In addition to the usual lattice and electronic terms, proportional to T/ sup 3/ and T, respectively, the specific heat of most rare earth metals at low temperatures has two other contributions: a magnetic speciflc heat due to exchange interaction between the electronic spins, and a nuclear specific heat due to splitting of the nuclear energy levels in the strong magnetic field produced by the 4f electrons. Samarium metal is antiferromagnetic below 13.6 deg K and the magnetic specific heat, according to the spin wave theory, should be proportional to T/sup 3/. The nuclear specific heat has a T/sup -2/ temperature dependence in the flrst approximation; the next term in a series expansion proportional to T/sup -4/ was also included in the analysis. Thus, C/sub p/= AT/ sup 3/ + BT + DT/sup -2/ -- ET/sup -4/, where the first term represents both the lattice and magnetic specific heats. Values of the constants, as determined by the method of least squares from 71 experimental points between 0.4 and 2.5 deg K, are (for specific heat in millijoules/mole deg K): A = 0.88 -- 1.11; B = 12.1; D = 8.56; E = 0.021. The magnetic speciftc heat appears to depend on the time the sample spent in the vicinity of the antiferromagnetic Curie point when it was cooled down, hence the variations in the value of A. Constants B and D are probably accurate to 5% and 2%, respectively. The effective magnetic field at the nucleus, as calculated from the value of constant D, is 3.3 x 10/sup 6/ gauss. (auth)
- Research Organization:
- Argonne National Lab., Ill.
- NSA Number:
- NSA-16-021189
- OSTI ID:
- 4815950
- 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- Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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
Similar Records
SPECIFIC HEAT OF TERBIUM METAL BETWEEN 0.37 AND 4.2 K
THE SPECIFIC HEAT OF GADOLINIUM AND YTTERBIUM METALS BETWEEN 0.4 AND 4K