Effect of Li3+ irradiation on the transport properties of La0.7Pb0.3MnO3 type CMR material

✍ Scribed by S. Chattopadhyay; A. Sarkar; A. Banerjee; S. Karmakar; D. Banerjee; R. Kumar; B.K. Chaudhuri

• Publisher: Elsevier Science
• Year: 2004
• Tongue: English
• Weight: 415 KB
• Volume: 226
• Category: Article
• ISSN: 0168-583X
• DOI: 10.1016/j.nimb.2004.06.022

✦ Synopsis

We report the low temperature (below the metal-insulator transition temperature T im ) resistivity and magnetoresistance (MR) behavior of 50 MeV Li 3+ beam irradiated La 0.7 Pb 0.3 MnO 3 for three different fluences. Ion beam irradiation causes a decrease of T im leading to the increase of insulating regime. Resistivity data of the unirradiated as well as irradiated samples fitted well with an equation of the form q = q 0 + q 2.5 T 2.5 which indicates predominant contribution from the electron-magnon interaction (second term). The temperature dependent MR data of samples irradiated with different ion fluences follow the simple relation [MR = a + b/(T + C)] showing appreciable effect of radiation on the parameters a, b and C. The physical significance of the radiation effect on these parameters is not yet very clear.