Affiliation: | QIN Zhi-Cheng (Institute of Physics. Academia Sinica, Beijing 100080, PRC; International Centre for Materials Physics, Academia Sinica. Shenyang 110015, PRC) LIU Shi-Chao YU Li-Zhi CHEN Hong and WANG Wen-Kui (Institute of Physics, Academia Sinica. Beijing 100080, PRC) |