Phase diagram of electrostatically doped Strontium Titanate (SrTiO3)

Details Phase diagram of electrostatically doped Strontium Titanate (SrTiO3) Phase diagram of electrostatically doped Strontium Titanate (SrTiO3)

2011-01-19

arxiv.org/abs/1101.3750v2

Physics

Condensed Matter

Superconductivity

Scientific paper

Electric double layer transistor configurations have been employed to electrostatically dope single crystals of insulating SrTiO_{3}. Here we report on the results of such doping over broad ranges of temperature and carrier concentration employing an ionic liquid as the gate dielectric. The surprising results are, with increasing carrier concentration, an apparent carrier-density dependent conductor-insulator transition, a regime of anomalous Hall effect, suggesting magnetic ordering, and finally the appearance of superconductivity. The possible appearance of magnetic order near the boundary between the insulating and superconducting regimes is reminiscent of effects associated with quantum critical behavior in some complex compounds.

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