Magnetic excitations and soft-mode transition in Pr2BaNiO5 A. Zheludev, J. M. Tranquada, T. Vogt and D. J. Buttrey Europhys. Lett., 35 5 (1996) 385-390 Published online: 01 September 2002 DOI: 10.1209/epl/i1996-00124-7