title: Gate dependence of upper critical field in superconducting (110) LaAlO3/SrTiO3 interface.
abstract: The fundamental parameters of the superconducting state such as coherence length and pairing strength are essential for understanding the nature of superconductivity. These parameters can be estimated by measuring critical parameters such as upper critical field, Hc2. In this work, Hc2 of a superconducting (110) LaAlO3/SrTiO3 interface is determined through magnetoresistive measurements as a function of the gate voltage, VG. When VG increases, the critical temperature has a dome-like shape, while Hc2 monotonically decreases. This relationship of independence between the variation of Tc and of Hc2 suggests that the Cooper pairing potential is stronger in the underdoped region and the coherence length increases with the increase of VG. The result is as for high temperature superconducting cuprates and it is different than for conventional low temperature superconductors.
authors.affiliation: Department of Physics, Beijing Normal University, Beijing 100875, China.
authors.forename: S C
authors.initials: SC
authors.lastname: Shen
authors.affiliation: Key Laboratory of Quantum Information, CAS, University of Science and Technology of China, Hefei, Anhui 230026, China.
authors.forename: B B
authors.initials: BB
authors.lastname: Chen
authors.affiliation: Department of Physics, Beijing Normal University, Beijing 100875, China.
authors.forename: H X
authors.initials: HX
authors.lastname: Xue
authors.affiliation: Key Laboratory of Quantum Information, CAS, University of Science and Technology of China, Hefei, Anhui 230026, China.
authors.forename: G
authors.initials: G
authors.lastname: Cao
authors.affiliation: Department of Physics, Beijing Normal University, Beijing 100875, China.
authors.forename: C J
authors.initials: CJ
authors.lastname: Li
authors.affiliation: Department of Physics, Beijing Normal University, Beijing 100875, China.
authors.forename: X X
authors.initials: XX
authors.lastname: Wang
authors.affiliation: Department of Physics, Beijing Normal University, Beijing 100875, China.
authors.forename: Y P
authors.initials: YP
authors.lastname: Hong
authors.affiliation: Key Laboratory of Quantum Information, CAS, University of Science and Technology of China, Hefei, Anhui 230026, China.
authors.forename: G P
authors.initials: GP
authors.lastname: Guo
authors.affiliation: Department of Physics, Beijing Normal University, Beijing 100875, China.
authors.forename: R F
authors.initials: RF
authors.lastname: Dou
authors.affiliation: Department of Physics, Beijing Normal University, Beijing 100875, China.
authors.forename: C M
authors.initials: CM
authors.lastname: Xiong
authors.affiliation: Department of Physics, Beijing Normal University, Beijing 100875, China.
authors.forename: L
authors.initials: L
authors.lastname: He
authors.affiliation: Department of Physics, Beijing Normal University, Beijing 100875, China.
authors.forename: J C
authors.initials: JC
authors.lastname: Nie