title: Bose-Einstein condensation of dilute magnons in TlCuCl3.
abstract: The recent observation [A. Oosawa et al., J. Phys. Condens. Matter 11, 265 (1999)] of the field-induced Neel ordering in the spin-gap magnetic compound TlCuCl3 is interpreted as a Bose-Einstein condensation of magnons. A Hartree-Fock-type calculation based on this picture is shown to describe the temperature dependence of the magnetization well.
authors.affiliation: Department of Physics, Tokyo Institute of Technology, Oh-okayama, Meguro-ku, Tokyo 152-8551, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Nikuni
authors.forename: M
authors.initials: M
authors.lastname: Oshikawa
authors.forename: A
authors.initials: A
authors.lastname: Oosawa
authors.forename: H
authors.initials: H
authors.lastname: Tanaka