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 1012 cm-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. © Published under licence by IOP Publishing Ltd.
Magnetic field induced transition in superconducting LaTiO 3/SrTiO3 interfaces / J., Biscaras; N., Bergeal; S., Hurand; C., Feuillet Palma; A., Rastogi; R. C., Budhani; Grilli, Marco; Caprara, Sergio; J., Lesueur. - In: JOURNAL OF PHYSICS. CONFERENCE SERIES. - ISSN 1742-6588. - STAMPA. - 449:1(2013), pp. 012035-1-012035-6. (Intervento presentato al convegno 10th International Conference on Materials and Mechanisms of Superconductivity, M2S 2012 tenutosi a Washington, DC nel 29 July 2012 through 3 August 2012) [10.1088/1742-6596/449/1/012035].
Magnetic field induced transition in superconducting LaTiO 3/SrTiO3 interfaces
GRILLI, Marco;CAPRARA, SERGIO;
2013
Abstract
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 1012 cm-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. © Published under licence by IOP Publishing Ltd.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.