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Diluted Oxide Interfaces with Tunable Ground States.

Yulin Gan¹, Dennis Valbjørn Christensen¹, Yu Zhang^1,2

¹Department of Energy Conversion and Storage, Technical University of Denmark, Risø Campus, 4000, Roskilde, Denmark.

Advanced Materials (Deerfield Beach, Fla.)

|January 15, 2019

Summary

This summary is machine-generated.

Alloying LaAlO3/SrTiO3 with LaMnO3 creates tunable oxide interfaces. This enables control over superconductivity and ferromagnetism, paving the way for novel electronic and spintronic devices.

Keywords:

2D electron liquid anomalous Hall effect metal-insulator transitions oxide interfaces superconductivity

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Area of Science:

Condensed Matter Physics
Materials Science
Oxide Electronics

Background:

The LaAlO3/SrTiO3 interface exhibits unique electronic properties.
Tailoring these properties for electronics and spintronics is challenging due to complex orbital populations.

Purpose of the Study:

To explore the tunability of the LaAlO3/SrTiO3 phase diagram by alloying with LaMnO3.
To investigate the emergence of superconductivity and ferromagnetism at the modified interface.

Main Methods:

Alloying LaAlO3 with LaMnO3 to create LaAl1-xMnxO3/SrTiO3 heterostructures.
Systematic variation of Mn doping concentration (x) from 0 to 1.
Characterization of interfacial electronic properties, including superconducting and ferromagnetic transitions.

Main Results:

A Lifshitz transition was observed at x = 0.225 with peak superconducting transition temperature (T_SC) of ~255 mK.
Ferromagnetism emerged at x ≥ 0.25.
At x = 0.3, a single device reproducibly showed both superconductivity and anomalous Hall effect signatures.

Conclusions:

Alloying LaAlO3/SrTiO3 with LaMnO3 offers unprecedented control over interfacial phase diagrams without lattice disorder.
This approach enables the design of oxide interfaces with coexisting superconductivity and ferromagnetism for advanced electronic and spintronic applications.