Low-energy excitations in the magnetized state of the bond-alternating quantum S=1 chain system NTENP

Abstract

High intensity inelastic neutron scattering experiments on the S=1 quasi-one-dimensional bond-alternating antiferromagnet Ni(C9D24N4)(NO2)ClO4 (NTENP) are performed in magnetic fields of up to 14.8~T. Excitation in the high field magnetized quantum spin solid (ordered) phase are investigated. In addition to the previously observed coherent long-lived gap excitation [M. Hagiwara et al., Phys. Rev. Lett 94, 177202 (2005)], a broad continuum is detected at lower energies. This observation is consistent with recent numerical studies, and helps explain the suppression of the lowest-energy gap mode in the magnetized state of NTENP. Yet another new feature of the excitation spectrum is found at slightly higher energies, and appears to be some kind of multi-magnon state.

arXiv comment5 pages, 4 fugures

References in corpus (7)

• Field-induced 3- and 2-dimensional freezing in a quantum spin liquid
• Evidence for the singlet-dimer ground state in an S = 1 antiferromag netic bond alternating chain
• Massive triplet excitations in a magnetized anisotropic Haldane spin chain
• Quasi-elastic neutron scattering in the high-field phase of a Haldane antiferromagnet
• Magnon decay in gapped quantum spin systems
• Distribution of exchange energy in a bond-alternating S=1 quantum spin chain
• Dynamical properties of S=1 bond-alternating Heisenberg chains in transverse magnetic fields

Cited by in corpus (9)

• Spontaneous Magnon Decays
• Field-induced decay dynamics in square-lattice antiferromagnet
• Phase Diagrams, Distinct Conformal Anomalies and Thermodynamics of Spin-1 Bond-Alternating Heisenberg Antiferromagnetic Chain in Magnetic Fields
• Edge singularities in high-energy spectra of gapped one-dimensional magnets in strong magnetic fields
• Finite-temperature scaling of spin correlations in an experimental realization of the one-dimensional Ising quantum critical point
• Modes of magnetic resonance of S=1 dimer chain compound NTENP
• Magnetic field-induced quasiparticle excitation in Nb3Sn: Evidence for anisotropic s-wave pairing
• Excitations from a chiral magnetized state of a frustrated quantum spin liquid
• Quantum critical dynamics and scaling in one-dimensional antiferromagnets