Measurements of the gate tuned superfluid density in superconducting LaAlO3/SrTiO3
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
The interface between the insulating oxides LaAlO3 and SrTiO3 exhibits a superconducting two-dimensional electron system that can be modulated by a gate voltage. While gating of the conductivity has been probed extensively and gating of the superconducting critical temperature has been demonstrated, the question whether, and if so how, the gate tunes the superfluid density and superconducting order parameter is unanswered. 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 collapse to a single curve characteristic of a full superconducting gap. Further, we show that the dipole moments observed in this system are not modulated by the gate voltage.
Fluctuations superconductivity and giant negative magnetoresistance in a gate voltage tuned 2D electron liquid with strong spin-orbit impurity scattering
Electrostatic Modulation of the Superfluid Density in a Ultrathin La2-xSrxCuO4 Film
通过在具有高介电常数的栅极绝缘体上施加电场，对欠掺杂的La 2-xSrxCuO 4膜进行电容充电，在氧化铜超导体的欠掺杂区域中，面超流密度n_{s\Box} $ of unprecedented strength were observed in measurements of the film kinetic inductance. Although $ n_{s\Box} $ appears to be substantially reduced by disorder, the data provide, for the first time on the same sample, direct compelling evidence for the Uemura relation $ T_{c} \propto n_{s\Box}（T=0）$的相对变化。
Correlation between unconventional superconductivity and strange metallicity revealed by operando superfluid density measurements
Institute of Physics, Chinese Academy of Sciences（中国科学院物理研究所）；Fudan University（复旦大学）；Southern University of Science and Technology（南方科技大学）；Harvard University（哈佛大学）；University of Chinese Academy of Sciences（中国科学院大学）；Songshan Lake Materials Laboratory（松山湖材料实验室）；Beijing Academy of Quantum Information Sciences（北京量子信息科学研究院）
