Magnetization profiles and NMR spectra of doped Haldane chains at finite temperatures

Details Magnetization profiles and NMR spectra of doped Haldane chains at finite temperatures Magnetization profiles and NMR spectra of doped Haldane chains at finite temperatures

2000-06-19

arxiv.org/abs/cond-mat/0006282v2

Phys. Rev. B 62, 14116 (2000)

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 5 figures, minor corrections

Scientific paper

10.1103/PhysRevB.62.14116

Open segments of S=1 antiferromagnetic spin chains are studied at finite temperatures and fields using continuous time Quantum Monte Carlo techniques. By calculating the resulting magnetization profiles for a large range of chain lengths with fixed field and temperature we reconstruct the experimentally measured NMR spectrum of impurity doped Y$_2$BaNi$_{1-x}$Mg$_x$O$_5$. For temperatures above the gap the calculated NMR spectra are in excellent agreement with the experimental results, confirming the existence of $S=1/2$ excitations at the end of open S=1 chain segments. At temperatures below the gap, neglecting inter chain couplings, we still find well defined peaks in the calculated NMR spectra corresponding to the $S=1/2$ chain end excitations. At low temperatures, inter chain couplings could be important, resulting in a more complicated phase.

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