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Title: Carrier-Controlled Ferromagnetism in SrTiO 3

Magnetotransport and superconducting properties are investigated for uniformly La-doped SrTiO 3 films and GdTiO 3/SrTiO 3 heterostructures, respectively. GdTiO 3/SrTiO 3 interfaces exhibit a high-density 2D electron gas on the SrTiO 3 side of the interface, while, for the SrTiO 3 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 SrTiO 3 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 GdTiO 3/SrTiO 3 heterostructures scales with the thickness of the SrTiO 3 quantum well. The results are used to construct a stability diagram for the ferromagnetic and superconducting phases of SrTiO 3.
Authors:
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Publication Date:
Type:
Published Article
Journal Name:
Physical Review X
Additional Journal Information:
Journal Volume: 2; Journal Issue: 2; Related Information: CHORUS Timestamp: 2017-04-05 23:02:44; Journal ID: ISSN 2160-3308
Publisher:
American Physical Society
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
OSTI Identifier:
1074808