[2] Dai P C[J]. Rev. Mod. Phys., 87, 855(2015).
[5] Ma L, Zhang J, Chen G F, Yu W Q[J]. Phys. Rev. B, 82, 180501(2010).
[15] Pitcher M J, Parker D R, Adamson P, Herkelrath S J C, Boothroyd A T, Ibberson R M, Brunell M, Clarke S J[J]. Chem. Commun., 45, 5918(2008).
[16] Li S C, Gan Y, Wang J H, Ran K J, Wen J S[J]. Acta Phys. Sin., 64, 097503(2015).
[21] Krüger E, Strunk H P[J]. J. Supercond. Nov. Magn., 27, 601(2014).
[22] Mollah S[J]. J. Phys.: Condens. Matter, 16, R1237(2004).
[23] Zhang J H, Ma R, Liu S, Liu M[J]. Acta Phys. Sin., 55, 4816(2006).
[24] Yu R[J]. Acta Phys. Sin., 64, 217102(2015).
[25] Chen Z J, Xu G B, Yan J G, Kuang Z, Chen T H, Li D H[J]. J. Appl. Phys., 120, 235103(2016).
[26] Yu R, Zhu J X, Si Q M[J]. Phys. Rev. Lett., 106, 186401(2011).
[27] Yi W, Wu Q, Sun L L[J]. Acta Phys. Sin., 66, 037402(2017).
[29] Acta Phys. Sin. 60 077402 (in Chinese)