Modes of magnetic resonance of S=1 dimer chain compound NTENP

Abstract

The spin dynamics of a quasi one dimensional $S=1$ bond alternating spin-gap antiferromagnet Ni(C${}_9$H${}_{24}$N${}_4$)NO${}_2$(ClO${}_4$) (abbreviated as NTENP) is studied by means of electron spin resonance (ESR) technique. Five modes of ESR transitions are observed and identified: transitions between singlet ground state and excited triplet states, three modes of transitions between spin sublevels of collective triplet states and antiferromagnetic resonance absorption in the field-induced antiferromagnetically ordered phase. Singlet-triplet and intra-triplet modes demonstrate a doublet structure which is due to two maxima in the density of magnon states in the low-frequency range. A joint analysis of the observed spectra and other experimental results allows to test the applicability of the fermionic and bosonic models. We conclude that the fermionic approach is more appropriate for the particular case of NTENP.

arXiv comment11 pages, 11 figures, published in Phys.Rev.B

References in corpus (12)

• Bose-Einstein Condensation in Magnetic Insulators
• Realization of Bose-Einstein condensation of dilute magnons in TlCuCl${}_3$
• Bose-Einstein Condensation of S = 1 Ni spin degrees of freedom in NiCl2-4SC(NH2)2
• Spin-resonance modes of the spin-gap magnet TlCuCl_3
• Evidence for the singlet-dimer ground state in an S = 1 antiferromag netic bond alternating chain
• Spin Dynamics of $NiC{l}_2-4SC(N{H}_2{)}_2$ in the Field-Induced Ordered Phase
• Magnetic Field Behaviour of a Haldane Gap Antiferromagnet
• Field-induced magnetic ordering in the Haldane system PbNi2V2O8
• Tomonaga-Luttinger Liquid in a Quasi-One-Dimensional S=1 Antiferromagnet Observed by the Specific Heat
• Distribution of exchange energy in a bond-alternating S=1 quantum spin chain
• Triplet spin resonance of the Haldane compound with interchain coupling
• Low-energy excitations in the magnetized state of the bond-alternating quantum S=1 chain system NTENP

Cited by in corpus (6)

• Spontaneous Magnon Decays
• Phase Diagrams, Distinct Conformal Anomalies and Thermodynamics of Spin-1 Bond-Alternating Heisenberg Antiferromagnetic Chain in Magnetic Fields
• Electron spin resonance study of anisotropic interactions in a two-dimensional spin gap magnet PHCC
• Control of superexchange interactions with DC electric fields
• Field theory analysis of S=1 antiferromagnetic bond-alternating chains in the dimer phase
• Electron spin resonance shifts in S=1 antiferromagnetic chains