Theory of ferromagnetism in Ca(1-x)La(x)B(6).
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.
Murakami
Shuichi
S
Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan. murakami@appi.t.u-tokyo.ac.jp
Shindou
Ryuichi
R
Nagaosa
Naoto
N
Mishchenko
Andrei S
AS