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
Corresponding email: yohanes.gunanto@uph.edu
Corresponding email: yohanes.gunanto@uph.edu
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
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
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| 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 |
Abstract
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