Curie-Weiss paramagnetism

Magnetic Susceptibilities. The magnetic susceptibilities of both plutonium compounds (Figure 3) show a weak Curie-Weiss paramagnetism for R, peff=0.87uB, 0=2.6°K9 and for P, Ueff=0.52jj]j,... 

The reduced orbital overlap between the radicals reduces the bandwidth and the electronic structures could be better considered as those of a localised rather than itinerant electron system. This poor overlap results in very small antiferromagnetic interactions being observed, and the compounds behave as nearly perfect Curie-Weiss paramagnets. In the cases when improved lateral interactions between the stacks are achieved by change of the substituents85 the compounds behave as weak ID ferromagnets due to the effective orthogonality of the S C interactions. 

Ground s g term is orbitally degenerate and well isolated from excited ones. Spin-only Hamiltonian for S = 2 is appropriate a Curie-Weiss paramagnet, x =/(g> ) Meff is constant down to low temperatures, then drops to zero. Special care must be taken with SH the axial MP needs to be averaged, gdv < gc, D = 0. CSC predicts moderate gap <5I4 between ground singlet and excited triplet... 

The Weiss constant 6 of the Curie-Weiss paramagnetic susceptibility plot x l(T) reflects the mean magnitude of the interatomic exchange interactions. LaMnOs has a 0 > 0, which reveals that the ferromagnetic interactions in the (001) planes are stronger than the c-axis... 

Extensive studies have revealed the mechanism for these novel properties. It is the interplay among many mechanisms the Peierls instability characteristic of one-dimensional system, the Mott transition in Coulomb interacting system, the mixed valence of Cu, the Jahn-Teller effect of Cu ions, and the Curie-Weiss paramagnetism of the 1/2-spin of Cu. The key role in showing the variety of properties was played by the structural deformation which causes a shift in the energy level of d-electrons of Cu. 

The reduction of FeClH(dppe)2 or [FeH(dppe)2] with 1 equiv of Na powder in toluene or benzene gives FeH(dppe)2 , a Curie-Weiss paramagnet (one unpaired electron) [23], Cryoscopy in benzene proves its monomeric nature. A subsequent study has described an improved synthetic route by bulk electrolysis of [FeH(MeCN)(dppe)2]+ in acetonitrile, and has shown that the compound displays reversible one-electron oxidation and one-electron reduction processes [60], An isoelectronic compound, FeH P(CH2CH2PPh2)3, has been generated by reversible coulometric reduction of [FeH P(CH2CH2PPh2)3)] and characterized by EPR spectroscopy [19],... 

The f-electrons in the lanthanides except Ce show an atomic-like localized behavior. Ce occupies a special position in the lanthanide series due to the presence of both the localized and delocalized character of the 4f-electrons. There are three important phases, a-, 3-, and y-Ce, in the phase diagram. Fee a-Ce is the most stable phase at low temperatures. The f-electron in a-Ce is considered to form an itinerant electron band and to play a significant role in the electronic properties, while the f-electrons in dhep P-Ce and fee y-Ce are often thought to be localized, exhibiting a Curie-Weiss paramagnetic behavior. In this study, we investigate this 4f-localization. 

The Curie-Weiss paramagnetic susceptibility [19] has a Peff = 3-84 Pb compared to a spin-only 2.83 Pb and a Weiss constant 0 = —665 K. 

Figure 10 shows the Curie-Weiss paramagnetic susceptibility x(T) and its inverse for the same single crystal of LaMnOs as measured under... 

The temperature dependence of y(T) below 200 K cannot be attributed to a Curie-Weiss paramagnetism from magnetic impurities,... 

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