Our site saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing our site without changing the browser settings you grant us permission to store that information on your device.
A. GAUR1,* , U. KR. GAUR2, K. YADAV2, G. D. VARMA2
The nanocrystalline La2/3Ca1/3MnO3 samples were prepared by sol-gel method and were sintered at different temperatures ranging from 600ºC to 1000ºC. It has been found that the magnetic and transport properties of the samples strongly depend on the sintering temperature. Decreasing the sintering temperature causes a substantial decrease in insulator-metal transition temperature (TIM) and enhancement in resistivity. Reduction in magnetization and slight decrease in paramagnetic-ferromagnetic (PM-FM) transition temperatures (Tc) has been observed as the sintering temperature decreases. The MR at T<Tc increases on decreasing the sintering temperature as well as on increasing the applied magnetic field. However, at/around Tc the intrinsic contribution of MR occurs which is more in the samples sintered at higher temperatures. These variations in MR are explained by enhanced spin polarized tunneling by assuming the increase of grain boundary contribution as the sintering temperature decreases.
Electrical transport, Nanocrystalline, Grain boundaries.
A. GAUR, U. KR. GAUR, K. YADAV, G. D. VARMA, Study of structural, magnetic and magneto-transport properties of nanocrystalline La2/3Ca1/3MnO3 manganite, Optoelectronics and Advanced Materials - Rapid Communications, 4, 7, July 2010, pp.989-994 (2010).
Submitted at: May 31, 2010
Accepted at: July 14, 2010
Optoelectronics and Advanced Materials - Rapid Communications
(2023): 0.5 - 2023 Journal Citation Reports (Clarivate Analytics, 2024)
Active accounts were imported to the new platform and assigned a random password by default. In order to access your account you need to access the login page and go through the Lost Password dialog (involves the system sending you an email with instructions) in order to reset your password. This step is necessary as passwords are kept in hashed form and the new platform uses modern hashing algorithms incompatible with the previous ones.