Gate-tuned superfluid density at the superconducting LaAlO 3/SrTiO 3 interface

Julie A. Bert, Katja C. Nowack, Beena Kalisky, Hilary Noad, John R. Kirtley, Chris Bell, Hiroki K. Sato, Masayuki Hosoda, Yasayuki Hikita, Harold Y. Hwang, Kathryn A. Moler

Research output: Contribution to journalArticlepeer-review


The interface between the insulating oxides LaAlO 3 and SrTiO 3 exhibits a superconducting two-dimensional electron system that can be modulated by a gate voltage. While the conductivity has been probed extensively and gating of the superconducting critical temperature has been demonstrated, the question as to whether, and if so how, the gate tunes the superfluid density and superconducting order parameter needs to be answered. We present local magnetic susceptibility, related to the superfluid density, as a function of temperature, gate voltage, and location. We show that the temperature dependence of the superfluid density at different gate voltages collapses to a single curve that is characteristic of a full superconducting gap. Further, we show that the dipole moments observed in this system are not modulated by the gate voltage.

Original languageEnglish
Article number060503
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number6
StatePublished - 7 Aug 2012

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


Dive into the research topics of 'Gate-tuned superfluid density at the superconducting LaAlO 3/SrTiO 3 interface'. Together they form a unique fingerprint.

Cite this