The quadratic-layer antiferromagnet

Antiferromagnetism and metamagnetism in 1,4-diazine and pyridine complexes of nickel(II)

“…In view of the comments made above regarding the relative magnitudes of exchange coupling and ZFS we consider it inappropriate to analyze the magnetic properties of these complexes employing one-dimensional or two-dimensional models which ignore ZFS effects (45,48,49). Analysis of the data employing the ZFS model modified to account for weak exchange as described above results in good agreement between experiment and theory ( Table 2).…”

“…Excellent fits as judged visually and by the the value of The magnetic properties of the two Ni(pyz),X, complexes studied here indicate that there is stronger antiferromagnetic exchange in comparison to that present in the tetrakis(1igand) complexes. In view of the proposed sheet structures for these pyrazine complexes, attempts were made to analyze their magnetic data using Lines high-temperature series expansion for a two-dimensional square-lattice S = 1 antiferromagnetic system in the Heisenberg limit (45). Satisfactory agreement between experiment and this theory was not obtained for Ni(pyz),(N03),.…”

A novel BEDT-TTF-based purely organic magnetic conductor, α - (BEDT - TTF)2(TEMPO - N(CH3)COCH2SO3) ⋅ 3H2O

“…The curve has a broad maximum around 100 K, which is a signature of a low-dimensional Heisenberg antiferromagnet. Indeed, the curve can be modelled well by a 2-D antiferromagnetic Heisenberg model [38]. The best fit [overlaid line in Fig.…”

Antiferromagnetic Ordering in Organic Conductor λ-(BEDT-TTF)2GaCl4 Probed by 13C NMR

“…χ increases with decreasing temperature and exhibits a broad hump structure that originates from the low-dimensional magnetic interaction network. We could explain the behavior of the χ by using the two-dimensional S = 1/2 square lattice Heisenberg AF model 16 with exchange interaction J/k B = 98 K, as shown by the red curve in Fig. 2.…”