Antiferromagnetic correlations

Fig. 18 Temperature dependence of the intensity of the ESR signal for three different crystal orientations. Inset the temperature dependence of the inverse ESR signal suggests antiferromagnetic correlations at high temperatures, which change to ferromagnetic ones close to Tc...

The value u> — 1) changes sign at y =, and as follows from Eqs.(42), the correlators show the antiferromagnetic structure of the ground state at [Pg.788]

Paramagnon energy is connected with antiferromagnetic correlation length ... 

The mixed-valence compound with stoichiometry [A][CrnCrln(ox)3] (A = NBu4, P(Ph)4) has also been synthesised and fully characterised structurally and magnetically [88], Again, although short-range antiferromagnetic correlations were ob-... 

The existence of strong antiferromagnetic correlations in heavy fermion metals has been confirmed by extensive neutron scattering studies ( 5), and these correlations are now thought to be responsible for both the large mass renormalizations and exotic superconductivity... 

Advances in Superconductivity XII, Proceedings of I2th International Symposium on Superconductivity (ISS 99), ed. T. Yamashita and T. Keiishi, Springer-Verlag Tokyo, Japan, 2000 J. L. Tallon, Antiferromagnetic Correlations and the Pseudogap in HTS Cuprates , p. 185... 

The superconducting fulleride (NH3) aK2C6o has been investigated using SQUID magnetometry and NMR in two differently doped samples. NMR relaxation measurements vahdate the interpretation of the spin susceptibility in terms of density of states and rule out the presence of strong antiferromagnetic correlations in the Fermi liquid. 

Inelastic neutron scattering experiments performed at 10 K displayed only a relatively broad quasi-elastic Lorentzian line with HWHM = (13 2) meV (Goldman et al. 1986a). Some indications of antiferromagnetic correlations were found by Neumann et al. (1986) up to 100 K. 

Aside from a region of temperature extremely close to the 3D phase transition, the antiferromagnetic correlations in La2Cu04 are essentially two-dimensional in character due to the very large anisotropy in the magnetic interactions in the Hamiltonian (eq. 2). The g-dependent static susceptibility of the 2D 5 = 4 Heisenberg antiferromagnet has... 

The shadow bands observed in the Fermi surface of Bi2212 by Aebi et al. (Aebi et al. 1994, Osterwalder et al. 1995) seen in normal-state measurements of the photoemission intensity at room temperature, were attributed to echoes of the bonding FS shifted by arising from strong antiferromagnetic correlations. This interpretation has... 

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