Carrier-controlled ferromagnetism in SrTiO3

Abstract

Magnetotransport and superconducting properties are investigated for uniformly La-doped SrTiO3 films and GdTiO3/SrTiO3 heterostructures, respectively. GdTiO3/SrTiO3 interfaces exhibit a high-density two-dimensional electron gas on the SrTiO3-side of the interface, while for the SrTiO3 films carriers are provided by the dopant atoms. Both types of samples exhibit ferromagnetism at low temperatures, as evidenced by a hysteresis in the magnetoresistance. For the uniformly doped SrTiO3 films, the Curie temperature is found to increase with doping and to coexist with superconductivity for carrier concentrations on the high-density side of the superconducting dome. The Curie temperature of the GdTiO3/SrTiO3 heterostructures scales with the thickness of the SrTiO3 quantum well. The results are used to construct a stability diagram for the ferromagnetic and superconducting phases of SrTiO3.

Revised version that is closer to the published version; Fig. 2 corrected

References in corpus (10)

• Magnetic effects at the interface between nonmagnetic oxides
• Direct imaging of the coexistence of ferromagnetism and superconductivity at the LaAlO3/SrTiO3 interface
• Coexistence of Magnetic Order and Two-dimensional Superconductivity at LaAlO${}_3$/SrTiO${}_3$ Interfaces
• Coexistence of superconductivity and ferromagnetism in two dimensions
• Extrinsic Magnetotransport Phenomena in Ferromagnetic Oxides
• Profiling the interface electron gas of LaAlO3/SrTiO3 heterostructures by hard X-ray photoelectron spectroscopy
• Electrostatic carrier doping of GdTiO3/SrTiO3 interfaces
• Electrolyte gate-controlled Kondo effect in SrTiO3
• Upper limit to magnetism in LaAlO3/SrTiO3 heterostructures
• A Search for Defect Related Ferromagnetism in SrTiO${}_3$

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