TY - JOUR
AU - Kawasaki, M.
AB - We briefly review principles and main features of an electric double layer transistor (EDLT) as well as electric field induced superconductivity in SrTiO 3 . EDLT is a field-effect transistor that employs an electrolyte as a gate dielectric. An electric double layer between a semiconductor and the electrolyte attains much higher breakdown field than the maximum of a solid gate dielectric, resulting in high density charge accumulation up to 10 14 cm -2 . That density is sufficient for inducing new physical phases, such as superconductivity and ferromagnetism, on various oxide systems. We employed a surface of a SrTiO 3 single crystal as a semiconductor channel. We have demonstrated insulator-tosuperconductor transition by electric field-effect without chemical doping. Charge carrier density was linearly increased from zero to 10 14 cm -2 with increasing gate bias to 3.5 V. Superconducting critical parameters, such as critical temperature T c , critical magnetic field H c , and critical current density J c were examined as a function of carrier density by varying gate bias. T c was almost constant as a function of the carrier density, contrasting to bell-shaped dependence of H c and J c . Temperature dependence of I-V curve shows the BKT-type transition, which indicates two-dimensional superconductivity in the electric field induced superconductivity.
TI - Emergence of superconductivity on a SrTiO 3 surface by electric-field charge accumulation
JO - Proceedings of SPIE
DO - 10.1117/12.879922
DA - 2011-02-10
UR - https://www.deepdyve.com/lp/spie/emergence-of-superconductivity-on-a-srtio-3-surface-by-electric-field-fqxSoaP09U
SP - 79400Q
EP - 79400Q-10
VL - 7940
IS - 1
DP - DeepDyve
ER -