Alternative spin states in synthetic analogs of biological iron-sulfur [4Fe-4S]+ clusters: further cases of variable ground states and the structure of (Et4N)3[Fe4S4(S-o-C6H4S-tert-Bu)4], containing a reduced cluster with a compressed tetragonal distortion

1989 ◽  
Vol 28 (8) ◽  
pp. 1497-1503 ◽  
Author(s):  
M. J. Carney ◽  
G. C. Papaefthymiou ◽  
R. B. Frankel ◽  
Richard H. Holm
Keyword(s):  
Ground States ◽  
Tetragonal Distortion ◽  
Spin States ◽  
Synthetic Analogs ◽  
Iron Sulfur

scholarly journals q-DEFORMATIONS OF QUANTUM SPIN CHAINS WITH EXACT VALENCE-BOND GROUND STATES

1994 ◽  
Vol 08 (25n26) ◽  
pp. 3645-3654 ◽  
Author(s):  
M.T. BATCHELOR ◽  
C.M. YUNG
Keyword(s):  
Condensed Matter ◽  
Valence Bond ◽  
Ground States ◽  
Quantum Spin ◽  
Total Spin ◽  
Spin Chains ◽  
The Other ◽  
Condensed Matter Physics ◽  
Spin States ◽  
Quantum Spin Chains

Quantum spin chains with exact valence-bond ground states are of great interest in condensed-matter physics. A class of such models was proposed by Affleck et al., each of which is su(2)-invariant and constructed as a sum of projectors onto definite total spin states at neighboring sites. We propose to use the machinery of the q-deformation of su(2) to obtain generalisations of such models, and work out explicitly the two simplest examples. In one case we recover the known anisotropic spin-1 VBS model while in the other we obtain a new anisotropic generalisation of the spin-½ Majumdar-Ghosh model.

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