Fluctuations antiferromagnetic

As already discussed for / H-(ET)2l3, the question remains why with the ESR p-value of 2.007 [330] a bare electron mass /ib larger than pc would be extracted. If no mass-enhancement due to electron-phonon interaction is considered, i. e., A = 0, a lower limit of the g value of 2.25 would be obtained from the dHvA data for / -(ET)2lBr2. This might hint at antiferromagnetic fluctuations or an appreciable electron-electron interaction which... 

Another facet of this competition is revealed by the contribution of the low- frequency antiferromagnetic fluctuations to the nuclear spin-lattice relaxation, as shown in Figure 2. As far as (TMTSF)2C104 is concerned, the temperature dependence of (T T)- scales with in... 

The nature of the pairing interaction remains an open question in organic superconductors. However, the existence of strongly developed antiferromagnetic fluctuations in (TMTSF)2X materials makes a non-phonon mediated pairing mechanism quite plausible. 

The thermal conductivity of CeCoIns has been studied in a magnetic field rotating within the 2D planes (Izawa et al., 2001). These data clearly reveal fourfold symmetiy for the thermal conductivity and indicate that the symmetiy most likely belongs to dx -y implying that the anisotropic antiferromagnetic fluctuation is relevant to the superconductivity. Independent... 

Non-Fermi-Liquid Behavior from Two-Dimensional Antiferromagnetic Fluctuations A Renormalization-Group and Large-N Analysis. 

The paramagnetic susceptibility has its maximum value at a Tmax > Tn, typical of a 2D antiferromagnet with short-range antiferromagnetic fluctuations. Torrance et al. [279] have reported the variation of T ax with x that is shown in Fig. 43. The localized spins within the normal state of the superconductive phase must contribute to Tmax since compositions 0.14 <... 

This picture explains quite well the observed antiferromagnetic fluctuation near Tc [41, 48], the central peak in spin excitation [64], strong spin wave softening and damping [65, 66], relatively low conductivity [39], smeared Fermi edge [67], and small thermopower [61, 62, 68]. In particular the ARPES studies show that the electronic dispersion is well deflned only up to about 1 eV below the Fermi level, and near the Fermi level it becomes totally smeared [67]. This smearing could be evidence of scattering by the split eg levels. Where the JT distortion is locally present, the eg level should be locally split and the potential locally lowered by A/2 = 0.7 eV. This distortion will scatter electrons within A/2 from the Fermi surface, as is observed. 

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