PPT Slide

R2BaNiO5 systems

R2BaNiO5: Haldane chains and magnetic rare earth ions

R=Y (non-magnetic) Isolated S=1 AF chains Haldane-gap AFM (D~10meV) No LRO

R=Nd, Pr, Tm, Er, Ho,.. (magnetic) R-mediated coupling between chains LRO at 25-80 K (Nd2BaNiO5: TN=48 K) Haldane excitations coexist with LRO

Statics: chain MF model

PRL 80, 3630 (1998)

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