Effect of cobalt substitution on magnetic and transport properties of Nd0.5Sr0.5Mn1−ð�?�¥Co𝑥O3 (ð‘�? = 0.1, 0.3 and 0.5)

Bulletin of materials science

Saket Asthana¹ 

[1] Advanced Functional Materials Laboratory, Department of Physics, Indian Institute of Technology Hyderabad Ordnance Factory Estate Yeddumailaram 502 205 Andhra Pradesh, India$$Advanced Functional Materials Laboratory, Department of Physics, Indian Institute of Technology Hyderabad Ordnance Factory Estate Yeddumailaram 502 205 Andhra Pradesh, IndiaAdvanced Functional Materials Laboratory, Department of Physics, Indian Institute of Technology Hyderabad Ordnance Factory Estate Yeddumailaram 502 205 Andhra Pradesh, India$$

关键词: Manganites;    cobaltates;    magnetic properties;    spin state transition;    charge order.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

The magnetic and transport properties of the compounds Nd_0.5Sr_0.5Mn_{1−ð�?��?}Co_ð‘�?O₃ (ð‘�? = 0.1, 0.3 and 0.5), synthesized by citrateâ€�?�gel route have been investigated. The spin transition in cobaltates at low temperatures affects the magnetic as well as transport properties. The irreversibility behaviour between the zero-field cooled (ZFC) and field cooled (FC) magnetization as a function of temperature becomes stronger with increasing Co content. This is understood on the basis of glassy behaviour, which becomes more robust with increasing Co substitution. The non-saturating Mâ€�?�H behaviour indicates strong magnetic inhomogeneities which may cause the magnetic phase separation at the nanoscopic length scale. The double exchange interaction is stronger between Mn³⁺â€�?�O^2âˆ�?â€�?�Mn⁴⁺ as compared to Co³⁺â€�?�O^2-â€�?�Co⁴⁺ pairs. Co-substitution suppresses the double exchange which will lead to cluster/spin glass like behaviour as well as semiconducting features due to localization of charge carriers (mobile ð‘�??_g electrons).

【 授权许可】

Unknown