Magnetic field induced transition in superconducting LaTiO3/SrTiO3 interfaces

10th International Conference on Materials and Mechanisms of Superconductivity

Biscaras, J.^1 ; Bergeal, N.^1 ; Hurand, S.^1 ; Feuillet-Palma, C.^1 ; Rastogi, A.^2 ; Budhani, R.C.^2,3 ; Grilli, M.^4 ; Caprara, S.^4 ; Lesueur, J.^1

LPEM- UMR8213/CNRS-ESPCI ParisTech-UPMC, 10 rue Vauquelin, 75005 Paris, France^1

Condensed Matter-Low Dimensional Systems Laboratory, Department of Physics, Indian Institute of Technology Kanpur, Kanpur 208016, India^2

National Physical Laboratory, New Delhi-110012, India^3

CNR-ISC, CNISM, Università di Roma La Sapienza, P.le Aldo Moro 5, 00185 Roma, Italy^4

关键词: Back-gate voltages;    Critical fields;    High magnetic fields;    Low temperatures;    Magnetic field induced transitions;    Perpendicular magnetic fields;    Quantitative comparison;    Theoretical modeling;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/449/1/012035/pdf
DOI  :  10.1088/1742-6596/449/1/012035

来源: IOP

【 摘 要 】

Superconductivity at the LaTiO3/SrTiO3 interface is studied by low temperature and high magnetic field measurements as a function of a back-gate voltage. We show that it is intimately related to the appearance of a low density (a few 1012cm-2) of high mobility carriers, in addition to low mobility ones always present in the system. These carriers form superconducting puddles coupled by a metallic two-dimensional electron gas, as revealed by the analysis of the phase transition driven by a perpendicular magnetic field. Two critical fields are evidenced, and a quantitative comparison with a recent theoretical model is made.