NMR Response in quasi one-dimensional Spin-1/2 Antiferromagnets

Abstract

Non-magnetic impurities break a quantum spin chain into finite segments and induce Friedel-like oscillations in the local susceptibility near the edges. The signature of these oscillations has been observed in Knight shift experiments on the high-temperature superconductor YBa${}_2$Cu${}_3$O${}_{6.5}$ and on the spin-chain compound Sr${}_2$CuO${}_3$. Here we analytically calculate NMR spectra, compare with the available experimental data for Sr${}_2$CuO${}_3$, and show that the interchain coupling is responsible for the complicated and so far unexplained lineshape. Our results are based on a parameter-free formula for the local susceptibility of a finite spin chain obtained by bosonization which is checked by comparing with quantum Monte Carlo and density-matrix renormalization group calculations.

final version

References in corpus (4)

• Chain breaks and the susceptibility of Sr_2Cu_{1-x}Pd_xO_{3+δ} and other doped quasi one-dimensional antiferromagnets
• Temperature driven crossover phenomena in the correlation lengths of the one-dimensional t-J model
• Thermodynamics of impurities in the anisotropic Heisenberg spin-1/2 chain
• Boundary susceptibility in the open XXZ-chain

Cited by in corpus (1)

• Consequences of lattice imperfections and interchain couplings for the critical properties of spin-1/2 chain compounds