title: Magnons as a Bose-Einstein condensate in nanocrystalline gadolinium.
abstract: The recent observation [S. P. Mathew et al., J. Phys. Conf. Ser. 200, 072047 (2010)] of the anomalous softening of spin-wave modes at low temperatures in nanocrystalline gadolinium is interpreted as a Bose-Einstein condensation (BEC) of magnons. A self-consistent calculation, based on the BEC picture, is shown to closely reproduce the observed temperature variations of magnetization and specific heat at constant magnetic fields.
authors.affiliation: School of Physics, University of Hyderabad, Central University PO, Hyderabad, India. kaulsp@uohyd.ernet.in
authors.forename: S N
authors.initials: SN
authors.lastname: Kaul
authors.forename: S P
authors.initials: SP
authors.lastname: Mathew