Elementary excitations, exchange interaction and spin-Peierls transition in CuGeO3

@article{Khomskii1996ElementaryEE,
  title={Elementary excitations, exchange interaction and spin-Peierls transition in CuGeO3},
  author={Daniel I. Khomskii and Wiebe Geertsma and Maxim Mostovoy},
  journal={Czechoslovak Journal of Physics},
  year={1996},
  volume={46},
  pages={3239-3246}
}
The microscopic description of the spin-Peierls transition in pure and doped CuGeO3 is developed taking into account realistic details of crystal structure. It it shown that the presence of side-groups (here Ge) strongly influences superexchange along Cu−O−Cu path, making it antiferromagnetic. Nearest-neighbour and next-nearest neighbour exchange constantsJnn andJnnn are calculated. Si doping effectively segments the CuO2-chains leading toJnn (Si)≃0 or even slightly ferromagnetic. Strong… 
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27 Citations

27 Citations

Spin-flop and spin-Peierls transition in doped CuGeO3.
Lattice dynamical effects on the peierls transition in one-dimensional metals and spin chains
The interplay of charge, spin and lattice degrees of freedom is studied for quasi-one-dimensional electron and spin systems coupled to quantum phonons. Special emphasis is put on the influence of the…
SPIN-PEIERLS MAGNET euGeO)
  • Sb Ras
  • Physics, Materials Science
  • 1998
The study of the magnetic and resonance properties of the single crystal CuGe03 were initiated by Petrakovskii and co-authors who first discovered the sharp decrease of the magnetic susceptibility…
Comparison effects of different doping on spin-Peierls transition in CuGeO3
Modeling a dimer state in CuGeO3 in the two-dimensional anisotropic Heisenberg model with alternated exchange interaction
The two-dimensional Heisenberg spin-1/2 model with alternated exchange interaction along the c axis and an anisotropic distribution of the exchange interaction in the lattice, Jb/Jc=0.1, is examined.…
Low-energy magnetic excitations in the dimerized and incommensurate phase of CuGeO3
Magnetic resonance in quantum spin chains
Abstract. The present understanding of quantum spin chains is reviewed from the magnetic resonance point of view. This includes both the ideal one-dimensional properties in the spin sector as well as…
Coherent spin dynamics of solitons in the organic spin chain compounds (o-DMTTF)2X(X=Cl,Br)
We studied the magnetic properties, in particular dynamics, of the correlated spins associated with natural defects in the organic spin chain compounds ($o$-DMTTF)$_2X$ ($X$ = Br, Cl) by means of…
Role of the Zhang-Rice-like exciton in optical absorption spectra of CuGeO 3 and CuGe 1-x Si x O 3 single crystals
The optical excitations in pure and Si-substituted CuGeO 3 are investigated in the 15-300 K temperature range. A structure, detected for the E field parallel to the c axis of the crystals at about…
Intra-chain superexchange couplings in quasi-1D 3d transition-metal magnetic compounds
TLDR
The results evidence PbCrBO4 and PbFeBO4 as antiferromagnetic (AFM) semiconductors (intra-chain AFM and inter-chain FM) and P bMnBO4 in accordance with experimental observations and M-M delocalization superexchange couplings dominating their magnetic properties.
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References

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