1. MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry/School of Marine Sciences, Sun Yat-Sen University, Guangzhou 510275/Zhuhai 519082, P. R. China
2. Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
3. Siberian Federal University, Krasnoyarsk 660041, Russia
4. Department of Physics, Far Eastern State Transport University, Khabarovsk 680021, Russia
5. Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, Dubna 141980, Russia
6. Institute of Resources Utilization and Rare Earth Development, Guangdong Academy of Sciences, Guangzhou 510650, P. R. China