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

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

2010-11-26

arxiv.org/abs/1011.5742v1

Physical Review B 82, 184406 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

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

Scientific paper

10.1103/PhysRevB.82.184406

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.

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