Distribution of exchange energy in a bond-alternating S=1 quantum spin chain

Abstract

The quasi-one-dimensional bond-alternating S=1 quantum antiferromagnet NTENP is studied by single crystal inelastic neutron scattering. Parameters of the measured dispersion relation for magnetic excitations are compared to existing numerical results and used to determine the magnitude of bond-strength alternation. The measured neutron scattering intensities are also analyzed using the 1st-moment sum rules for the magnetic dynamic structure factor, to directly determine the modulation of ground state exchange energies. These independently determined modulation parameters characterize the level of spin dimerization in NTENP. First-principle DMRG calculations are used to study the relation between these two quantities.

arXiv comment10 pages, 10 figures

References in corpus (9)

• The density-matrix renormalization group
• Phase Diagram of $S=1$ Bond-Alternating XXZ chains
• Triplet Waves in a Quantum Spin Liquid
• Continuum in the spin excitation spectrum of a Haldane chain, observed by neutron scattering in CsNiCl3
• Haldane-gap excitations in the low-H_c 1-dimensional quantum antiferromagnet NDMAP
• Evidence for the singlet-dimer ground state in an S = 1 antiferromag netic bond alternating chain
• Multi-particle States in Spin-1 Chain System CsNiCl3
• Low-temperature properties of the spin-1 antiferromagnetic Heisenberg chain with bond-alternation
• Quasi-elastic neutron scattering in the high-field phase of a Haldane antiferromagnet

Cited by in corpus (11)

• Phase Diagrams, Distinct Conformal Anomalies and Thermodynamics of Spin-1 Bond-Alternating Heisenberg Antiferromagnetic Chain in Magnetic Fields
• Experimental confirmation of spin gap in antiferromagnetic alternating spin-3/2 chain substances RCrGeO5 (R = Y or 154Sm) by inelastic neutron scattering experiments
• Finite-temperature scaling of spin correlations in an experimental realization of the one-dimensional Ising quantum critical point
• Low-energy excitations in the magnetized state of the bond-alternating quantum S=1 chain system NTENP
• Modes of magnetic resonance of S=1 dimer chain compound NTENP
• Dynamical properties of S=1 bond-alternating Heisenberg chains in transverse magnetic fields
• Series expansion analysis of a tetrahedral cluster spin chain
• Quantum critical dynamics and scaling in one-dimensional antiferromagnets
• Effects of Randomness on the Field-Induced Phase Transition in the S=1 Bond-Alternating Spin Chain NTENP
• Field theory analysis of S=1 antiferromagnetic bond-alternating chains in the dimer phase
• Two topological phases in exchange alternating spin-1 nanographene chains