| Popis: |
We present an inelastic neutron scattering study performed throughout the field-induced magnetic phase occurring between H c 1 ≃ 3.5 T and H c 2 ≃ 4.5 T in the spin 1/2 alternating antiferromagnetic chain compound Cu ( NO 3 ) 2 · 2.5 D 2 0 . The exchange couplings are consistently determined from the analysis of the spin dynamics both in the gapped phase, at H = 0 , and in the saturated phase, at H = 6 T , while the cancellation of the lowest energy gap in the complete field-induced magnetic phase suggests that this system is a good realization of a Bose–Einstein condensation. |
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