IPA-CuCl$_3$: a S=1/2 Ladder with Ferromagnetic Rungs

Details IPA-CuCl$_3$: a S=1/2 Ladder with Ferromagnetic Rungs IPA-CuCl$_3$: a S=1/2 Ladder with Ferromagnetic Rungs

2005-06-15

arxiv.org/abs/cond-mat/0506382v1

Physics

Condensed Matter

Strongly Correlated Electrons

2 pages, 2 figures, submitted to proceedings of LT24, Orlando, FL, August 2005

Scientific paper

10.1063/1.2355055

The spin gap material IPA-CuCl3 has been extensively studied as a ferromagnetic-antiferromagnetic bondalternating S = 1/2 chain. This description of the system was derived from structural considerations and bulk measurements. New inelastic neutron scattering experiments reveal a totally different picture: IPA-CuCl3 consists of weakly coupled spin ladders with antiferromagnetic legs and ferromagnetic rungs. The ladders run perpendicular to the originally supposed bondalternating chain direction. The ferromagnetic rungs make this system equivalent to a Haldane S = 1 antiferromagnet. With a gap energy of 1.17(1) meV, a zone-boundary energy of 4.1(1) meV, and almost no magnetic anisotropy, IPA-CuCl3 may the best Haldane-gap material yet, in terms of suitability for neutron scattering studies in high magnetic fields.

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