High Magnetic Field ESR in the Haldane Spin Chains NENP and NINO

Details High Magnetic Field ESR in the Haldane Spin Chains NENP and NINO High Magnetic Field ESR in the Haldane Spin Chains NENP and NINO

1999-06-17

arxiv.org/abs/cond-mat/9906273v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, RevTeX, 4 figures

Scientific paper

10.1103/PhysRevB.61.88

We present electron spin resonance experiments in the one-dimensional antiferromagnetic S=1 spin chains NENP and NINO in pulsed magnetic fields up to 50T. The measured field dependence of the quantum energy gap for B||b is analyzed using the exact diagonalization method and the density matrix renormalization group method (DMRG). A staggered anisotropy term (-1)^i d(S_i^x S_i^z + S_i^z S_i^x) was considered for the first time in addition to a staggered field term (-1)^i S_i^x B_st. We show that the spin dynamics in high magnetic fields strongly depends on the orthorhombic anisotropy E.

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