Title

BaN: A nearly ideal realization of the Heisenberg chain with antiferromagnetic interactions

Document Type

Article

Publication Date

1-1-1996

Abstract

We report an inelastic-neutron-scattering experiment on single crystals of the one-dimensional spin-one antiferromagnet (Formula presented)BaNi(Formula presented). The data show that this compound is a nearly ideal material for studying the Haldane conjecture in the Heisenberg limit. In particular, the Haldane gap at (Formula presented) is almost isotropic, taking on the values of 7.5(1), 8.6(1), and 9.6(1) meV for polarizations parallel to the three principal orthorhombic axes respectively. Interchain coupling along the edges of the orthorhombic unit cell is found to be very weak ((Formula presented)). Finally, we show that defects in our sample at the 1% level cause visible broadening of the excitation at (Formula presented). © 1996 The American Physical Society.

Publication Source (Journal or Book title)

Physical Review B - Condensed Matter and Materials Physics

First Page

R6827

Last Page

R6830

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