Magnetic specific heat of linear chains with Heisenberg exchange and crystal-field anisotropy forS=1

1975 ◽  
Vol 11 (11) ◽  
pp. 4402-4408 ◽  
Author(s):  
T. de Neef ◽  
W. J. M. de Jonge
Keyword(s):  
Specific Heat ◽  
Crystal Field ◽  
Heisenberg Exchange ◽  
Linear Chains ◽  
Magnetic Specific Heat

MAGNETIC SPECIFIC HEAT OF CoCl2.2 PYRAZINE BELOW 2 K.

1978 ◽  
Vol 39 (C6) ◽  
pp. C6-762-C6-764 ◽  
Author(s):  
D. Gonzalez ◽  
J. Bartolomé ◽  
R. Navarro ◽  
F. J.A.M. Greidanus ◽  
L. J. De Jongh
Keyword(s):  
Specific Heat ◽  
Magnetic Specific Heat

THE COMBINED ANALYSIS OF SPECIFIC HEAT AND THERMAL EXPANSION OF Nd1−xLuxMn2 COMPOUNDS

1993 ◽  
Vol 07 (01n03) ◽  
pp. 810-813
Author(s):  
N.H. KIM-NGAN ◽  
P.E. BROMMER ◽  
J.J.M. FRANSE
Keyword(s):  
Magnetic Properties ◽  
Thermal Expansion ◽  
Thermodynamic Properties ◽  
Specific Heat ◽  
Crystal Field ◽  
Spin Fluctuation ◽  
Spin Reorientation ◽  
Antiferromagnetic Order ◽  
Combined Analysis ◽  
Temperature Range

Specific heat and thermal expansion measurements have been performed on Nd1−xLUxMn2 in the temperature range between 1.5K and 300K. Below 10K, anomalies are observed which are ascribed to a spin reorientation of the Nd sublattice. These anomalies are only slightly affected by the substitution of Nd by Lu. Large effects, however, are observed on the magnetic properties of the Mn sublattice. The antiferromagnetic order disappears for x exceeding 0.30. The data are analysed in terms of Grüneisen parameters. In the paramagnetic compound LuMn2, a spin-fluctuation contribution to the thermodynamic properties is observed. In the Nd-containing compounds, distinct contributions from the crystal field acting on the Nd ions can be distinguished. The variation of the magnetic properties of the Mn sublattice with the concentration of Lu is discussed.

INFLUENCE OF CRYSTAL FIELD EXCITATIONS COUPLED TO LATTICE VIBRATIONS ON THERMODYNAMICAL PROPERTIES OF A TWO-LEVEL PARAMAGNET

2004 ◽  
Vol 18 (03) ◽  
pp. 337-348
Author(s):  
J. ULNER ◽  
J. PEISERT ◽  
K. DURCZEWSKI
Keyword(s):  
Green Function ◽  
Specific Heat ◽  
Crystal Field ◽  
Field Model ◽  
Lattice Vibrations ◽  
Coupling Constant ◽  
Phonon Field ◽  
Thermodynamical Properties ◽  
Weakly Coupled ◽  
Perturbative Method

A two-level crystal field model in the presence of the phonon field is considered. Spins are arranged on a lattice and weakly coupled to the lattice oscillations of small amplitudes. The anticommutator Green function perturbative method up to the second order in the coupling constant is applied to find thermodynamical quantities. The magnetic spectral function, describing the crystal field excitations, influences these quantities. The effect is studied numerically and illustrated in figures. In particular, the influence of the coupling on the Schottky specific heat is shown.

Theoretical and experimental magnetic specific heat of CsMnCl3· 2H2O

1975 ◽  
Vol 11 (6) ◽  
pp. 2364-2369 ◽  
Author(s):  
K. Kopinga ◽  
T. de Neef ◽  
W. J. M. de Jonge
Keyword(s):  
Specific Heat ◽  
Magnetic Specific Heat
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