Thermoelectric, Magnetic Properties and Re-entrant Spin-glass State in MBE Grown FeAs Film on LaAlO3(100) Substrate. (1st February 2023)

• Record Type: Journal Article
• Authors: Van Thiet, Duong; Dung, Dang Duc; Nguyen, Van Quang; Duong, Anh Tuan; Chung, Nguyen Xuan; Hong, Nguyen Tuan; Cho, Sunglae
• Is Part Of: ECS journal of solid state science and technology. Volume 12:Number 2(2023)
• Publication Date: 2023-02-01
• Subjects: Solid state chemistry -- Periodicals; Electronics -- Materials -- Periodicals; Electrochemistry -- Periodicals; 541.0421
• DOI: 10.1149/2162-8777/acb96c
• Languages: English
• ISSNs: 2162-8777

Abstract

Abstract : We report on the growth, thermoelectric, magnetic properties, and re-entrant spin-glass state in MnP-type orthorhombic FeAs thin film, grown on LaAlO3 (100) substrate by using a molecular beam epitaxy. The film is polycrystalline with a grain size about 200 nm. Electrical resistivity as a function of temperature revealed a metallic behavior. A sign change of Seebeck coefficient was observed at 370 K, due to the contribution of multiple bands to charge transport. We found a re-entrant spin-glass state in the film, attributed to strain in the sample. As a result, a very sharp spin-glass magnetic transition at 50 K was observed in the temperature dependence of Seebeck coefficient, electrical resistivity, and magnetization curves. The bifurcation point between zero field cooled and field cooled magnetization occurred at 350 K. A ferromagnetic-type behavior was observed over a temperature range from 10 to 300 K, confirming the re-entrant spin-glass state. Where the determined magnetization and coercive field are small, around 7 emu cm −3 and 300 Oe at 10 K, respectively. Our work provided a study on thermoelectric and magnetic properties of re-entrant spin-glass FeAs in thin film form