Subtle interplay between localized magnetic moments and itinerant electrons in LaAlO3/SrTiO3 heterostructures

Hu, Hai-Long and Zeng, Rong and Pham, Anh and Tan, Thiam Teck and Chen, Zhigang and Kong, Charlie and Wang, Danyang and Li, Sean (2016) Subtle interplay between localized magnetic moments and itinerant electrons in LaAlO3/SrTiO3 heterostructures. ACS Applied Materials and Interfaces, 8 (21). pp. 13630-13636. ISSN 1944-8244

Abstract

Clarification of the role of magnetic ordering and scattering in two-dimensional electron gas has become increasingly important to understand the transport and magnetic behavior in the LaAlO3 (LAO)/SrTiO3 (STO) heterostructures. In this work, we report the sheet resistance of the LAO/STO heterostructures as functions of temperature, magnetic field, and field orientation. An unexpected resistance minimum was discovered at 10 K under a sufficiently high in-plane magnetic field. An anisotropic magnetoresistance (MR) is clearly identified, indicating the presence of magnetic scattering which may be related to the interaction between itinerant electrons and localized magnetic moments in the LaAlO3/SrTiO3 heterostructures. It is believed that the high concentration of oxygen vacancies induced by the ultralow oxygen partial pressure during the deposition process plays a predominant role in the occurrence of the anisotropic MR.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published version cannot be displayed due to copyright restrictions.
Faculty / Department / School: No Faculty
Date Deposited: 12 Jun 2017 05:02
Last Modified: 12 Jun 2017 05:03
Uncontrolled Keywords: anisotropic magnetoresistance; itinerant electrons; LaAlO3/SrTiO3 heterostructures; localized magnetic moments; oxygen vacancy; deposition process; field orientation; in-plane magnetic fields; itinerant electrons; localized magnetic moments; magnetic behavior; magnetic scattering; oxygen partial pressure; rare earth metals; magnetism, basic concepts and phenomena; chemical products generally; physical properties of gases, liquids and solids; crystalline solids
Fields of Research : 03 Chemical Sciences > 0303 Macromolecular and Materials Chemistry > 030399 Macromolecular and Materials Chemistry not elsewhere classified
03 Chemical Sciences > 0306 Physical Chemistry (incl. Structural) > 030699 Physical Chemistry not elsewhere classified
09 Engineering > 0904 Chemical Engineering > 090499 Chemical Engineering not elsewhere classified
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970103 Expanding Knowledge in the Chemical Sciences
Identification Number or DOI: 10.1021/acsami.6b01518
URI: http://eprints.usq.edu.au/id/eprint/31666

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