Two-dimensional Heisenberg model with spin s=1/2 and antiferromagnetic exchange treated as a spin liquid

2002 ◽  
Vol 44 (6) ◽  
pp. 1122-1129 ◽  
Author(s):  
E. V. Kuz’min
Keyword(s):  
Heisenberg Model ◽  
Spin Liquid ◽  
Antiferromagnetic Exchange ◽  
Two Dimensional

Synthesis, spectroscopic and magnetic properties of some pyrazine-bridged iron(II) sulfonate complexes

1988 ◽  
Vol 66 (8) ◽  
pp. 2079-2087 ◽  
Author(s):  
John S. Haynes ◽  
John R. Sams ◽  
Robert C. Thompson
Keyword(s):  
Heisenberg Model ◽  
Hyperfine Splitting ◽  
Variable Temperature ◽  
Magnetic Data ◽  
Antiferromagnetic Coupling ◽  
Antiferromagnetic Exchange ◽  
Two Dimensional ◽  
Scanning Calorimetry ◽  
Best Fit ◽  
Magnetic Hyperfine Splitting

Six new pyrazine-bridged complexes of iron(II) have been prepared and studied using magnetic susceptibility, differential scanning calorimetry, and vibrational, electronic, and Mössbauer spectroscopic methods. Fe(pyz)(CF3SO3)2 exhibits a susceptibility maximum at 4.4 K and analysis of the magnetic data according to a two-dimensional S = 2 system in the (isotropic) Heisenberg limit yields best-fit values of J = −0.26 cm−1 and g = 2.20. Variable temperature Mössbauer spectra between 4.2 and 1.6 K are also reported for this compound and show the onset of magnetic hyperfine splitting below ~3.8 K. Analysis of magnetic data for Fe(pyz)2(CH3SO3)2 and Fe(pyz)2(CF3SO3)2•CH3OH according to the two-dimensional Heisenberg model also indicates the presence of weak antiferromagnetic exchange in these complexes (J = −0.18 and −0.20 cm−1, respectively). No clear evidence for magnetic concentration was obtained from our studies on Fe(pyz)2(CIO4)2, Fe(pyz)(p-CH3C6H4SO3)2, and Fe(pyz)(p-CH3C6H4SO3)2•2CH3OH; any antiferromagnetic coupling in these complexes must be considerably weaker than in the other complexes studied.

scholarly journals Quantum-spin-liquid states in the two-dimensional kagome antiferromagnets ZnxCu4−x(OD)6Cl2

2007 ◽  
Vol 6 (11) ◽  
pp. 853-857 ◽  
Author(s):  
S.-H. Lee ◽  
H. Kikuchi ◽  
Y. Qiu ◽  
B. Lake ◽  
Q. Huang ◽  
...  
Keyword(s):  
Quantum Spin ◽  
Spin Liquid ◽  
Two Dimensional ◽  
Liquid States ◽  
Quantum Spin Liquid
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