Anomalous Spin Dynamics in Doped Quantum Antiferromagnets
J. Jaklic, P. Prelovsek
TL;DR
This paper investigates the finite-temperature spin dynamics in doped quantum antiferromagnets using Lanczos diagonalization, revealing coexistence of different spin fluctuation timescales and supporting a marginal Fermi-liquid scenario consistent with experimental observations.
Contribution
It introduces a novel computational approach to study spin dynamics in doped antiferromagnets and links theoretical results to experimental data in cuprates.
Findings
Coexistence of free-fermion-like and spin-fluctuation timescales.
Pronounced temperature dependence of susceptibility below T<J.
Calculated NMR relaxation rates align with experimental data.
Abstract
Finite-temperature spin dynamics in planar t-J model is studied using the method based on the Lanczos diagonalization of small systems. Dynamical spin structure factor at moderate dopings shows the coexistence of free-fermion-like and spin-fluctuation timescales. At T<J, the low-frequency and static susceptibility show pronounced T dependence, supporting a scenario, related to the marginal Fermi-liquid one, for the explanation of neutron-scattering and NMR-relaxation experiments in cuprates. Calculated NMR relaxation rates reasonably reproduce experimental ones.
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