Magnetic Properties of Isostructural BaCoP2O7, BaNiP2O7, and BaCuP2O7Studied with dc and ac Magnetization and Specific Heat

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.

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Susceptibility of Chromium?Based Alloys of Transition Elements

Australian Journal of Physics ◽

10.1071/ph600451a ◽

1960 ◽

Vol 13 (2) ◽

pp. 451 ◽

Cited By ~ 10

Author(s):

WM Lomer

Keyword(s):

Magnetic Properties ◽

Transition Metals ◽

Specific Heat ◽

Room Temperature ◽

Spin Moment ◽

Transition Elements ◽

Dilute Solutions ◽

Spin Orientation ◽

Local Moments ◽

The Matrix

The magnetic properties of chromium�based alloys with the transition metals are very varied. Below room temperature it is believed that chromium is antiferrcmagnetic and in this paper we investigate briefly the nature of the influence of this antiferrcmagnetic matrix on the properties of dilute solutions of atoms carrying weIl�defined local moments of their own. It is shown that various anomalies in the susceptibility-temperature relations can be rationalized in terms of a model involving small spin orientation forces arising from the antiferromagnetism. Alloying with vanadium appears to reduce the spin moment on the chromium atoms, but to introduce no localized spins itself. The temperature.independent contribution of cobalt in solution is interpreted in terms of local spins locked by the antiferromagnetism of the matrix. The :results so far obtained suggest that careful specific heat measurements in the range 0--100 OK may disclose very significant anomalies in many of. these alloys.

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Specific Heat and Low Field Magnetic Properties of Co(S1−xSex)2

phys stat sol (a) ◽

10.1002/pssa.2210740151 ◽

1982 ◽

Vol 74 (1) ◽

pp. K31-K35 ◽

Cited By ~ 2

Author(s):

G. A. Petrakovskii ◽

A. G. Klimenko ◽

F. S. Rakhmenkulov ◽

A. V. Baranov

Keyword(s):

Magnetic Properties ◽

Specific Heat ◽

Low Field

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SPECIFIC HEAT OF UPd2Al3

International Journal of Modern Physics B ◽

10.1142/s021797929300010x ◽

1993 ◽

Vol 07 (01n03) ◽

pp. 38-41 ◽

Cited By ~ 2

Author(s):

R. J. RADWAŃSKI ◽

J. J. M. FRANSE

Keyword(s):

Magnetic Properties ◽

Energy Level ◽

Specific Heat ◽

Ground State ◽

Exchange Parameter ◽

State Function ◽

Hexagonal Symmetry ◽

Energy Level Scheme ◽

Schottky Type ◽

Good Agreement

Particularities in the specific heat of UPd 2 Al 3, a λ-type of peak with a maximum at 14.5 K and a Schottky-type of peak with a broad maximum at 55 K, has been attributed to the 5f-subsystem of the U atoms. The U-5f contribution has been found to be described surprisingly well within a single-ion Hamiltonian that includes the charge multipolar (CMP) interactions and the antiferromagnetic (AF) exchange interaction between the U 3+ ions. The AF exchange parameter and the full set of the CMP parameters associated with the hexagonal symmetry have been evaluated. The energy-level scheme (ELS) of this Kramers ion is constructed. The ground-state function Γ8 of the 5f 3 electrons is highly anisotropic. This state results from higher-order charge multipolar interactions. Magnetic properties resulting from this scheme including the metamagnetic-like transition at 18 T, the strongly-reduced value for the U-ion moment and its field dependence are found to be in good agreement with experimental observations.

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