Ordering patterns antiferromagnetically

Figure 33. Herringbone orientational correlation functions F (3.15) in the inset and the logarithmic derivatives 62 In (3.18) as a function of distance I in units of the lattice constant a - 4.26 A in the disordered phase of the anisotropic-planar-rotor model (2.5) from Monte Carlo simulations at 7" = 25.5 K and a linear system size of L = 180. The different symbols distinguish the three symmetty axes a, and the dashed line marks the plateau 2/. In the inset all three F fall on top of each other and the different symbols denote here the two oscillating parts of the antiferromagnetic-like ordering pattern. (Adapted from Fig. 1 of Ref. 273.)...

Figure 7.5 Antiferromagnetic spin ordering patterns, schematic, referred to an idealised cubic unit cell (a) A-type (001) alignment (b) C-type (110) alignment (c) E-type (d) C-type (I II)p alignment...

As reported by Blanco et al. (1999), neutron diffraction patterns of powder and bulk polycrystalline samples of GdCu were obtained for both structures in the cubic CsCl type of structure, which orders antiferromagnetically at 7n 150 K, a propagation vector of ( j 0) has been found with the moments probably parallel to the c-axis (note that other noncollinear magnetic structures might give rise to the same neutron-diffraction pattern). In the orthorhombic low temperature phase (7n 45 K) the available diffraction patterns... 

Figure 2. (a) A-type antiferromagnetic spin order, (6) Jahn-Teller distortion pattern and (c) orbital ordering in LaMn03 (after Rao (2000)). 

If an applied magnetic field is present, a loop current pattern that is different from that for the antiferromagnetic loop-current order mentioned above will be realized. If we denote the wave function for the antiferromagnetic pattern by F, the wave function for the different current pattern is given by... 

A distinct maximum in the temperature dependence of x found at 74 K marks an antiferromagnetic transition in UNi2Ge2. The linear 1/x versus T curve above this temperature was fitted by a CW law and yields the parameters displayed in table 4.6. The neutron diffraction pattern taken at 4.2 K indicates antiferromagnetic order of the AF-I type. Magnetic moments of 2.35jub located at the U atoms are parallel to the c-axis (Chelmicki et al. 1985). 

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