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arXiv:cond-mat/9802245

Magnetic Structure and NMR signal of Spin Peierls Solitons

D. Foerster, Yann Meurdesoif, B. Malet

Published Feb 23, 1998• 0 citations
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Abstract

We compute the magnetic profile of spin Peierls solitons in a simple Heisenberg model with magneto elastic couplings, using independently the DMRG method and the Hartree Fock approximation. Our results agree qualitatively with published NMR data provided we average over the spin profiles. We conclude that he dynamics of the spin plus lattice system must be included in a more detailed theory of the spin Peierls transition in CuGeO.

DOI
10.48550/arxiv.cond-mat/9802245

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We compute the magnetic profile of spin Peierls solitons in a simple Heisenberg model with magneto elastic couplings, using independently the DMRG method and the Hartree Fock approximation. Our results agree qualitatively with published NMR data provided we average over the spin profiles. We conclude that he dynamics of the spin plus lattice system must be included in a more detailed theory of the spin Peierls transition in CuGeO.
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Abstract The role of dynamical magneto-elastic coupling in spin–Peierls chains is investigated by various numerical techniques. We show that, generically, a Heisenberg spin chain coupled to dynamical optical phonons exhibits a transition towards a spontaneously dimerized state. The low energy excitations are characterized as topological solitons. No binding between solitons occurs in the isolated spin–phonon chain. However, elastic interchain coupling can lead to the formation of bound states.
The one-dimensional spin-Peierls model with quantum phonons is studied with an optimal phonon method combined with the density matrix renormalization group. By calculating the ground state in the sector Sz = 1 I obtain a soliton-antisoliton pair. The soliton is compared to nuclear magnetic resonance experiments which image the soliton lattice present in CuGeO3 under a high magnetic field. Reasonable agreement with experiment can be achieved by choosing a large value of the phonon frequency and the spin phonon coupling constant. This indicates that CuGeO3 is in a non-adiabatic strongly coupled parameter regime. A robust feature of the calculations is an attraction between solitons even without interchain coupling.