Pressure and magnetic field effects on transport properties of ceramic and film samples (La0.7Ca0.3)1-xMn1+xO3
|Vladimir I. Mikhaylov 1, Vladimir P. Dyakonov 1, Valery A. Shtaba 1, Eduard E. Zubov 1, Oleksiy V. Pashchenko 1, Andrzej Szewczyk , Kazimir Piotrowski 2, Henryk Szymczak|
1. National Academy of Sciences of Ukraine, Donetsk Technical-Physical Institute, R. Luxemburg 72, Donetsk 83114, Ukraine
Many physical characteristics including the Curie temperature TC, the metal-insulator transition temperature TMI, and resistance in doped lantanum perovskite manganites - materials having "colossal" magnetoresistance (CMR) can be changed to a considerable extent by internal chemical as well as by external physical pressure. The pressure and magnetic field effects on transport and magnetoresistance effect (MRE) have been studied in both the epitaxial films and ceramics of manganites with excess manganese (La0.7Ca0.3)1-xMn1+xO3 (x = 0 - 0.2). A comparison of electrical behaviour in both kinds of ceramic and film samples of similar composition under the influence of hydrostatic pressure (up to 2 GPa) and magnetic field (up to 8 kOe) has been performed. The pressure as well as magnetic field decreases the resistivity in the region of the metal-insulator transition and shifts TMI to higher temperatures. TMI and MRE are shown to increase with increasing manganese content.
Presentation: poster at E-MRS Fall Meeting 2003, Symposium D, by Vladimir I. Mikhaylov
See On-line Journal of E-MRS Fall Meeting 2003
Submitted: 2003-05-15 12:13 Revised: 2009-06-08 12:55