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Tuning the spin Hamiltonian of NENP by external pressure: a neutron scattering study | | I. A. Zaliznyak D. C. Dender
; C. Broholm
; Daniel H. Reich
; | | Date: |
13 Sep 1997 | | Subject: | cond-mat | | Affiliation: | 1,2,3) D. C. Dender (1,2), C. Broholm (1,2), and Daniel H. Reich ( Department of Physics and Astronomy, The Johns Hopkins University, Baltimore National Institute of Standards and Technology, Gaithersburg, Maryland P. Kapitza Institute for Physical | | Abstract: | We report an inelastic neutron scattering study of antiferromagnetic spin dynamics in the Haldane chain compound Ni(C2H8N2)2NO2ClO4 (NENP) under external hydrostatic pressure P = 2.5 GPa. At ambient pressure, the magnetic excitations in NENP are dominated by a long-lived triplet mode with a gap which is split by orthorhombic crystalline anisotropy into a lower doublet centered at $Delta_perpapprox$ 1.2meV and a singlet at $Delta_parallelapprox$ 2.5meV. With pressure we observe appreciable shifts in these levels, which move to $Delta_perp{(2.5GPa)}approx$ 1.45 meV and $Delta_parallel(2.5GPa)approx$ 2.2meV. The dispersion of these modes in the crystalline c-direction perpendicular to the chain was measured here for the first time, and can be accounted for by an interchain exchange J’_c approximately 3e-4*J which changes only slightly with pressure. Since the average gap value $Delta_Happrox$ 1.64 meV remains almost unchanged with P, we conclude that in NENP the application of external pressure does not affect the intrachain coupling J appreciably, but does produce a significant decrease of the single-ion anisotropy constant from D/J = 0.16(2) at ambient pressure to D/J = 0.09(7) at P = 2.5 GPa. | | Source: | arXiv, cond-mat/9709150 | | Services: | Forum | Review | PDF | Favorites | |
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