CuCl2(C10H8N2) - S=1/2 Heisenberg Antiferromagnet on Square Lattice

Čižmár, E.; Kajňaková, M.; Orendáč, M.; Orendáčová, A.; Feher, A.; Papageorgiou, T.

doi:10.1007/s10582-004-0142-z

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“…where α = J /J, represents the model system to investigate the crossover from 2D HAF with the Néel ordered ground state to one-dimensional spin-chain system with disordered ground state [3]. This work is devoted to the study of magnetic properties of a material from the class of CuX 2 (bipy), where bipy = C 10 H 8 N 2 is 4,4 -bipyridyl and X = Cl, Br [4,5], which belong to prototypical S = 1/2 rectangular HAF systems. The material CuBr 2 (bipy) crystallizes in a monoclinic lattice (space group C2/m) and represents structurally a system with rectangular covalent layers formed in bc plane.…”

Section: Introductionmentioning

confidence: 99%

CuBr₂(C₁₀H₈N₂) - S = 1/2 Two-Dimensional Rectangular Heisenberg Antiferromagnet

et al. 2010

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Magnetic susceptibility and X-band electron spin resonance study of a two-dimensional Heisenberg antiferromagnetic system CuBr2(bipy), where bipy = C10H8N2 is 4,4-bipyridyl, has been performed in the temperature range from 300 K down to 2 K. A rhombic anisotropy of the g-factor was obtained from X-band EPR measurements with gx = 2.037, gy = 2.100 and gz = 2.219. The temperature dependence of the magnetic susceptibility with a round maximum observed at 28 K suggests antiferromagnetic type of short-range order. No signature of the magnetic long-range order in studied compound was observed. The comparison of the magnetic susceptibility data with a two-dimensional rectangular Heisenberg model yields the values of intralayer exchange couplings J/kB = −47 K and J /kB = −9.4 K.

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Section: Introductionmentioning

confidence: 99%