title: Theory of ferromagnetism in Ca(1-x)La(x)B(6).
abstract: Novel ferromagnetism in Ca(1-x)La(x)B(6) is studied in terms of the Ginzburg-Landau theory for excitonic-order parameters, taking into account symmetry of the wave functions. We found that the minima of the free energy break both inversion and time-reversal symmetries, while the product of these two remains preserved. This explains various novelties of the ferromagnetism and predicts a number of magnetic properties, including the magnetoelectric effect, which can be tested experimentally.
authors.affiliation: Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan. murakami@appi.t.u-tokyo.ac.jp
authors.forename: Shuichi
authors.initials: S
authors.lastname: Murakami
authors.forename: Ryuichi
authors.initials: R
authors.lastname: Shindou
authors.forename: Naoto
authors.initials: N
authors.lastname: Nagaosa
authors.forename: Andrei S
authors.initials: AS
authors.lastname: Mishchenko