title: Quantum size effects on the perpendicular upper critical field in ultrathin lead films.
abstract: We report the thickness-dependent (in terms of atomic layers) oscillation behavior of the perpendicular upper critical field Hc2perpendicular in the ultrathin lead films at the reduced temperature (t = T/Tc). Distinct oscillations of the normal-state resistivity as a function of film thickness have also been observed. Compared with the Tc oscillation, the Hc2perpendicular shows a considerable large oscillation amplitude and a pi phase shift. The oscillatory mean free path caused by the quantum size effect plays a role in Hc2perpendicular oscillation.
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China.
authors.forename: Xin-Yu
authors.initials: XY
authors.lastname: Bao
authors.forename: Yan-Feng
authors.initials: YF
authors.lastname: Zhang
authors.forename: Yupeng
authors.initials: Y
authors.lastname: Wang
authors.forename: Jin-Feng
authors.initials: JF
authors.lastname: Jia
authors.forename: Qi-Kun
authors.initials: QK
authors.lastname: Xue
authors.forename: X C
authors.initials: XC
authors.lastname: Xie
authors.forename: Zhong-Xian
authors.initials: ZX
authors.lastname: Zhao