Ce-doped LCMO CMR manganites: a consequence of enhanced $T_{c}$ and $T_{ext{IM}}$

Bulletin of materials science

S K Singh¹  D K Mishra¹  P K Mishra⁴  D R Sahu²  B K Mohapatra¹  B K Roul³ 

[1] Advanced Materials Technology Department, Institute of Minerals and Materials Technology (CSIR), Bhubaneswar 751 013, India$$Advanced Materials Technology Department, Institute of Minerals and Materials Technology (CSIR), Bhubaneswar 751 013, IndiaAdvanced Materials Technology Department, Institute of Minerals and Materials Technology (CSIR), Bhubaneswar 751 013, India$$;School of Physics and DST/NRF Centre of Excellence in Strong Materials, University of the Witwatersrand, Private Bag 3, Wits 2050, Johannesburg, South Africa$$School of Physics and DST/NRF Centre of Excellence in Strong Materials, University of the Witwatersrand, Private Bag 3, Wits 2050, Johannesburg, South AfricaSchool of Physics and DST/NRF Centre of Excellence in Strong Materials, University of the Witwatersrand, Private Bag 3, Wits 2050, Johannesburg, South Africa$$;Institute of Materials Science, Planetarium Building, Bhubaneswar 751 013, India$$Institute of Materials Science, Planetarium Building, Bhubaneswar 751 013, IndiaInstitute of Materials Science, Planetarium Building, Bhubaneswar 751 013, India$$;Technical Physics and Prototype Engineering Division, Bhabha Atomic Research Centre, Mumbai 400 085, India$$Technical Physics and Prototype Engineering Division, Bhabha Atomic Research Centre, Mumbai 400 085, IndiaTechnical Physics and Prototype Engineering Division, Bhabha Atomic Research Centre, Mumbai 400 085, India$$

关键词: Metal insulator transition;    spin glass transition;    solid-state reaction route.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

A series of Ce-doped (1â€�??20 mol%) La_0.67Ca_0.33MnO₃ (LCMO) sintered (1400°C) ceramic samples were prepared by the solid-state reaction route. The significant enhancement of metal insulator transition temperature ($T_{ext{IM}} approx$ 280 K) and Curie transition temperature ($T_{c} approx$ 270 K) associated with LCMO system by the addition of 10 mol% of Ce has been observed. Further interesting observation showed that both low (â‰�? 1 mol%) and high (â‰�? 15 and 20 mol%) level of Ce-doping in LCMO reduced the $T_{ext{IM}}$ appreciably from 280 K to 220 K, and from 100 to 160 K, respectively exhibiting the signature of a unique spin glass transitions at around 30 K. Structural and spectroscopic studies revealed that unreacted CeO₂ and MnO₂ phases are found to be present in 1, 15, 20 mol% Ce-doped LCMO samples, which is one of the reasons why they show spin glass transition at low temperature. Our present results on bulk Ce-doped (10 mol%) LCMO are found to be encouraging as far as $T_{ext{IM}}$ of epitaxial La_0.7Ce_0.3MnO₃ thin film ($T_{ext{IM}} approx$ 250 K) is concerned. This finding suggests that single-phase materials of Ce-doped (10 mol%) LCMO can be prepared with enhanced $T_{ext{IM}}$ effectively using solid-state reaction route.

【 授权许可】

Unknown