Temperature hysteretic effect and its influence on colossal magnetoresistance of La0.33Nd0.33Ca0.33MnO3

Pramana

R Pinto¹  A A Tulapurkar¹  Reeta Vij²  R G Kulkarni²  Darshan C Kundaliya1²  U Vaidya¹ 

[1] Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, India$$;Department of Physics, Saurashtra University, Rajkot 360 005, India$$

关键词: Colossal magnetoresistance;    temperature hysteretic effect;    domains.;   

DOI  :  

学科分类：物理（综合）

来源: Indian Academy of Sciences

【 摘 要 】

Electrical resistance (𝑅) measurements of a bulk La0.33Nd0.33Ca0.33MnO3 perovskite in magnetic fields up to 40 kOe have revealed anomalous temperature hysteretic effects both in 0 Oe and 20 kOe magnetic fields. The sharp peak observed in the 𝑅 vs. 𝑇 plot indicates the occurrence of metal-to-insulator (M–I) transition at a temperature of 𝑇MI = 110 K and 140 K, for cooling and warming paths, respectively. An applied magnetic field of 20 kOe reduces the resistance and shifts 𝑇MI to 160 K and 185 K for cooling and warming, respectively. We have observed a much higher resistance in the cooling path than in the warming path leading to the hysteretic resistance ratio (𝑅cool/𝑅warm) of 200 at 110 K and 1.8 at 160 K for 0 Oe and 20 kOe, respectively. Record values of colossal magnetoresistance (CMR) have been achieved. The CMR value reaches nearly 99% in the temperature ranges of 90 K to 140 K and 90 K to 170 K for 20 kOe and 40 kOe magnetic fields in the cooling mode, respectively. The observed unusual behavior is attributed to the co-existence of La-rich and Nd-rich domains assumed to be distributed randomly in the compound.

【 授权许可】

Unknown