Light-induced decoupling of electronic and magnetic properties in manganites

The strongly correlated material La_0.7Sr_0.3MnO_3 (LSMO) exhibits metal-to-insulator and magnetic tran-sition near room temperature. Although the physical properties of LSMO can be manipulated by strain, chemical doping, temperature, or magnetic field, they often require large external stimuli. To...

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Bibliographic Details
Authors: Navarro, H., Basaran, Ali C., Ajejas, F., Fratino, L., Bag, S., Wang, T. D., Qiu, E., Rouco Gómez, Víctor, Tenreiro Villar, Isabel, Torres, F., Rivera Calzada, Alberto Carlos, Santamaría Sánchez-Barriga, Jacobo, Rozenberg, M., Schuller, Ivan K.
Format: article
Publication Date:2023
Country:España
Institution:Universidad Complutense de Madrid (UCM)
Repository:Docta Complutense
Language:English
OAI Identifier:oai:docta.ucm.es:20.500.14352/88162
Online Access:https://hdl.handle.net/20.500.14352/88162
Access Level:Open access
Keyword:538.9
Room-Temperature
Thin-Films
Magnetoresistance
Física de materiales
2211 Física del Estado Sólido
Description
Summary:The strongly correlated material La_0.7Sr_0.3MnO_3 (LSMO) exhibits metal-to-insulator and magnetic tran-sition near room temperature. Although the physical properties of LSMO can be manipulated by strain, chemical doping, temperature, or magnetic field, they often require large external stimuli. To include addi-tional flexibility and tunability, we developed a hybrid optoelectronic heterostructure that uses photocarrier injection from cadmium sulfide (CdS) to an LSMO layer to change its electrical conductivity. LSMO exhibits no significant optical response; however, the CdS/LSMO heterostructures show an enhanced conductivity, with a resistance drop of about 37%, at the transition temperature under light stimuli. This enhanced conductivity in response to light is comparable to the effect of a 9 T magnetic field in pure LSMO. Surprisingly, the optical and magnetic responses of CdS/LSMO heterostructures are decoupled and exhibit different effects when both stimuli are applied. This unexpected behavior shows that het-erostructuring strongly correlated oxides may require a new understanding of the coupling of physical properties across the transitions and provide the means to implement new functionalities.

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