Antiferromagnetic spin fluctuations

Abstract The condensation energy for the antiferromagnetic spin fluctuations... 

In this present paper we ll calculated the condensation energy on basis of antiferromagnetic spin fluctuation mechanism of pairing in high-Tc superconductors. 

Early was proposed to used the functional integral methods for calculation the thermodynamic properties of high-Tc superconductors including antiferromagnetic spin fluctuations [5],... 

The antiferromagnetic antiferromagnetic spin fluctuations which result in d-pairing in cuprate superconductor are described by the Lagrangian in lattice representation [5-7] ... 

Tin. Antiferromagnetic spin fluctuations in CeRhSn were studied using... 

Now, Ks is proportional to the uniform susceptibility xstaggered susceptibility xq enhanced largely by the antiferromagnetic spin fluctuations as follows... 

It is well known that the 1 /T value of Cu in high- Tc materials is governed by the antiferromagnetic spin fluctuation (AFSF) of Cu. Therefore, the increase in /T with jc is concluded to be due to the change of AFSF with x. The fact that 1 / T is scaled by T/1 indicates an intimate correlation between Tc and AFSF. 

The discovery of antiferromagnetic spin fluctuations in UPts (AeppU et al., 1987) prompted Miyake et al. (1986) to study the nature of pairing due to antiferromagnetic spin fluctuations. The authors consider pairing in a single-band model with the effective electron interaction of eq. (12) where the nometarded interaction —7(q) should have a maximum at an AF wave... 

Fig. 6. Paramagnetic critical scattering in La2Cu04. Energy-integrating scans across the two-dimensional rod of scattering measure the Fourier transform of the instantaneous spin-spin correlation function in La2Cu04 above T. The peak width (corrected for finite instrumental resolution) is the inverse correlation length for antiferromagnetic spin fluctuations. The dashed lines show the experimental resolution function, and the solid lines are the results of fits to a Lorentzian lineshape convolved with the resolution for three different temperatures. From Kcimer et al. (1992).

Fig. 8. Inverse magnetic correlation length for antiferromagnetic spin fluctuations in lightly doped La2, Sr,Cu04. The lines are based on a simple model in which the zero-temperature limit of K is governed by the doping, and the temperature dependence is derived from the renormalized classical expression (eq. 5). From Keimer et al. (1992).

The indications of antiferromagnetic spin fluctuations in liquid cesium at low density provide a clue to the incipient formation of spin-paired species such as the dimer Cs2 and dimer clusters in the subcritical liquid and dense vapor. We have discussed calculations (Redmer and Warren 1993a,b) which predict dimer formation in this range. In Sec. 3.4 we describe structural evidence for the presence of this species. 

Because of its huge y-value (265mJ/molK ) PuAlj fits into the heavy-fermion sequence in the Kadowaki-Woods plot (Kadowaki and Woods 1986). Trainor et al. (1976) assumed that antiferromagnetic spin fluctuations dominate the low-temperature behaviour of PuAlj magnetoresistance experiments would be interesting in this respect. However, the " Pu isotope should be used for such low-temperature measurements to avoid self-heating problems. 

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