Yoshimi, R.
Yasuda, K.
Tsukazaki, A.
Takahashi, K. S.
Nagaosa, N.
Kawasaki, M.
Tokura, Y.
Article History
Received: 6 March 2015
Accepted: 31 August 2015
First Online: 26 October 2015
Competing interests
: The authors declare no competing financial interests.