Wu, H. J.
Zhao, L.-D.
Zheng, F. S.
Wu, D.
Pei, Y. L.
Tong, X.
Kanatzidis, M. G.
He, J. Q.
Article History
Received: 10 April 2014
Accepted: 26 June 2014
First Online: 29 July 2014
Competing interests
: The authors declare no competing financial interests.