Quantum size effects on the perpendicular upper critical field in ultrathin lead films.
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.
Bao
Xin-Yu
XY
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China.
Zhang
Yan-Feng
YF
Wang
Yupeng
Y
Jia
Jin-Feng
JF
Xue
Qi-Kun
QK
Xie
X C
XC
Zhao
Zhong-Xian
ZX