Pauli-spin susceptibility

Pauli spin susceptibility for the aligned CNTs has been measured and it is reported that the aligned CNTs are also metallic or semimetallic [30]. The temperature dependence of gn and gx s plotted in Fig. 5(a). Both values increase with decreasing temperature down to 40 K. A similar increase is observed for graphite. The g-value dependence on the angle 0 at 300 K is shown in Fig. 5(b) (inset). The g-value varies between gn = 2.0137 and gx= 2.0103 while the direction of magnetic fields changes from parallel to perpendicular to the tubes. These observed data fit well as... 

This quantity is called the Pauli spin susceptibility. 

By substituting Eqs. (2) and (3) into Eq.(l) and dividing it by Vu, the unit molecular volume of [TCNQ-TTF], Pauli spin susceptibility is reduced to... 

Magnetic Susceptibility of TiNi has been previously observed [39] to be temperature independent and interpreted as due to Pauli spin susceptibility. This categorizes the magnetic property as one that is insensitive to the atomic arrangement. The magnetic susceptibility has the constant values, 2.1 x 10 6 (emu/g) below the Ms and 3.0 x 10"6 (emu/g) above the As temperature. Between these two temperatures a plot of the data has a triangular form but as predicted, no difference is observed between those obtained from complete and incomplete cycles. 

Note, however, that the formation of bipolarons is limited to doping levels below the metal-insulator transition. In the metallic regime, the magnetic susceptibility is dominated by the Pauli spin susceptibility of the metal [109]. 

Figure 5.10 Left calculated component resolved Pauli spin contributions to the magnetic susceptibilities of Ag Pti- as a function of the Ag concentration. The Pauli spin susceptibilities are given without Stoner enhancement x and with Stoner enhancement x, in-...

I. Pauli spin susceptibility. Unlike free spin systems, the magnetic suscep-... 

The discovery 5 th when in solution in concentrated sulfuric acid, poly aniline is in the protonated form, [B-NH-B-NH-]+ n, and that it is recovered as the partially crystalline salt, [B-NH-B-NH-]+ n(HS04 )n, from solutions in sulfuric acid O y precipitation in water or methanol) has opened the way to a more complete characterization of the polymer, and to studies directed toward the determination of the intrinsic properties of the ordered material. For example, the temperature independence of the spin susceptibility of the more highly ordered crystalline material above 125K is consistent with the Pauli spin susceptibility expected for a metal,with a density of states at the Fermi level estimated as 1 state per eV per formula unit (two rings). 

The temperature dependence of the g-factor is shown in fig. 48 (Schlott 1989). For temperatures above 20 K, g T) closely follows the tempeiatuie dependence of the bulk susceptibility. At low temperatures the onset of moment compensation is clearly visible leading to an enhanced temperature-indqrendent Pauli-spin susceptibility. Fig. 48 clearly indicates the power and the potential of magnetic resonance experiments Moment compensation can easily be detected in the local susceptibility of microscopic measurements. It can hardly be detected in bulk measurements due to the contributions from defect states with local moments. 

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