• International Journal of Technology (IJTech)
  • Vol 8, No 1 (2017)

Phase Transitions in La0.73Ca0.27Mn1-xCuxO3 (0 < X < 0.19)

Phase Transitions in La0.73Ca0.27Mn1-xCuxO3 (0 < X < 0.19)

Title: Phase Transitions in La0.73Ca0.27Mn1-xCuxO3 (0 < X < 0.19)
Y. E. Gunanto, W. A. Adi, S. Poertadji, T. Ono, H. Tanaka, E. Steven

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Published at : 31 Jan 2017
Volume : IJtech Vol 8, No 1 (2017)
DOI : https://doi.org/10.14716/ijtech.v8i1.5980

Cite this article as:
Gunanto, Y.E., Adi, W.A. Poertadji, S., Ono, T., Tanaka, H., Steven, E., 2017. Phase Transitions in La0.73Ca0.27Mn1-xCuxO3 (0 < X < 0.19). International Journal of Technology. Volume 8(1), pp. 66-75

Y. E. Gunanto Department of Biology Education, Faculty of Education, University of Pelita Harapan, Karawaci, Tangerang 15811, Indonesia
W. A. Adi Center for Science and Technology of Advanced Materials, BATAN, Tangerang Selatan 15314, Indonesia
S. Poertadji Department of Physics, University of Indonesia, Depok 16424, Indonesia
T. Ono Department of Physics, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan
H. Tanaka Department of Physics, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8551, Japan
E. Steven Department of Physics, National High Magnetic Field Lab., Tallahassee, Florida 32310, USA
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Phase Transitions in La0.73Ca0.27Mn1-xCuxO3 (0 < X < 0.19)

We have performed resistivity measurements as a function of temperature, with and without an external magnetic field. Magnetization measurements are also done as a function of temperature M(T) as well as a function of an external magnetic field M(H) for La0.73Ca0.27Mn1-xCuxO3 compounds with 0<x<0.19. The samples with x = 0 and 0.06 are insulators. As for the samples with x = 0.10, 0.13, and 0.19, they undergo an insulator to metal transition as the temperature is lowered. The insulator-metal transition temperatures are 24 K, 74 K, and 69 K for x = 0.10, 0.13, and 0.19, respectively. The magnetoresistance decreases with increasing values of Cu, i.e. 75%, 72%, 64%, and 35% for x = 0, 0.06, 0.10, and 0.13 respectively. Samples in accordance with the model of crystalline metal Ln R vs. 1/T are compared to Mott insulator models Ln R vs. 1/T0.25. Based on the magnetization curve, a paramagnetic to ferromagnetic transition is observed at Curie temperature, TC, of ~ 196 K, 170 K, 140 K, 137 K, and 113 K for x = 0, 0.06, 0.10, 0.13, and 0.19 respectively.

Curie temperature; Magnetoresistance; Metal-insulator transition