Magnetic Structure and NMR signal of Spin Peierls Solitons

TL;DR

This paper investigates the magnetic structure of spin Peierls solitons using computational methods, comparing results with experimental NMR data, and emphasizes the importance of including spin-lattice dynamics in theoretical models.

Contribution

It provides a comparative analysis of DMRG and Hartree Fock methods for spin Peierls solitons and highlights the need for dynamic spin-lattice modeling in understanding the transition.

Findings

Qualitative agreement with NMR data after averaging spin profiles

Both DMRG and Hartree Fock methods yield consistent magnetic profiles

Dynamic spin-lattice interactions are crucial for accurate modeling

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.