Electrical and thermodynamic study of SrTiO3 reduction using the van der Pauw method

Author(s)

Oliveira, Felipe Souza ^[1] ; Guimaraes, Luan Gabriel ^[1] ; dos Santos, Carlos Alberto Moreira ^[1] ; de Lima, Bruno Sanches ^{[2, 1]} ; da Luz, Mario Sergio ^[3]

Affiliation

^[1] Univ Sao Paulo, Escola Engn Lorena, BR-12602810 Lorena, SP - Brazil

^[2] Univ Sao Paulo, Inst Fis Sao Carlos, BR-13566590 Sao Carlos, SP - Brazil

^[3] Univ Fed Triangulo Mineiro, Inst Ciencias Tecnol & Exatas, BR-13025180 Uberaba, MG - Brazil

• Document type: Journal article
• Source: Materials Chemistry and Physics; v. 263, APR 15 2021.
• Web of Science Citations: 1

Abstract

This work deals with SrTiO3-delta single crystals annealed under vacuum. The electrical resistivity and the carrier density were measured at room temperature by the van der Pauw method using an Arduino-based device for automatic contact switching integrated to the Quantum Design PPMS. The data acquired from the annealed samples were plotted along with a data compilation from several previous reports. The analyses confirm a linear scaling between the electrical resistivity and the Hall coefficient which attends for a wide doping window. Hence, the room temperature carrier density can be estimated from a simple electrical resistivity measurement. A brief discussion about the thermodynamics of the vacuum annealing process is reported. The entalphy is estimatted as 3.6(4) eV for the SrTiO3 reduction process. (AU)

• FAPESP's process: 09/54001-2 - Acquisition of cryogen-free equipment for the characterization of magnetic properties by vibrating sample magnetometry
• Grantee: Carlos Alberto Moreira dos Santos
• Support Opportunities: Multi-user Equipment Program