APPLIED PHYSICS LETTERS

MAO JH, HUANG L, PAN Y, GAO M, HE JF, ZHOU HT, GUO HM, TIAN Y, ZOU Q, ZHANG LZ, ZHANG HG, WANG YL, DU SX, ZHOU XJ, CASTRO NETO AH, GAO HJ

PHYSICAL REVIEW B

GUO YF, GUO WL, CHEN CF