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E. Steven, E.
Department of Physics, National High Magnetic Field Lab., Tallahassee, Florida, USA

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KAJIAN PEROVSKITE LA0,73CA0,27MN1-XCUXO3 DENGAN 0 Gunanto, Y. E.; Sinaga, K.; Purwanto, A.; Kurniawan, B.; Poertadji, S.; Steven, E.; Brooks, J. S.
Jurnal Spektra Vol 15, No 1 (2014): Spektra: Jurnal Fisika dan Aplikasinya
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We have performed the synthesis and characterization of materials La0.73Ca0.27Mn1-xCuxO3 for 0 <x< 0.19 using  neutron scattering diffraction (HRPD) and SQUID.All the samples are already in phase with the crystal structure  orthorombic and space group P nma. Parameters of the Mn-O bond length obtained from the charactyerization HRPD. From  the parameters of Mn-O bond length can be determined the value of Jahn-Teller distortion. The greater x will result in an  average radius of position B (<rB>) increasing and the tolerance factor t decreasing. From the characterization of the SQUID  was found that the maximum value of conductivity for Cu-doped samples will be lower when compare to the sample without  doping, except for Cu=0.10. If the value of the conductivity is getting smaller, the activation energy will be higher. Keywords: Jahn-Teller distortion, factor tolerance, conductivity, activation energy
MAGNETORESISTANCE in La0.1Ca0.9MnO3 Gunarto, Y.E.; Kurniawan, B.; Poertadji, S.; Steven, E.
Jurnal Spektra Vol 16, No 2 (2015): Spektra: Jurnal Fisika dan Aplikasinya
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AbstractWe have performed measurements of resistivity as a function of temperature with a certain large external magnetic field and resistivity as a function of the external magnetic field in room temperature conditions for L0.1C0.9MnO3 compound. Measurement of resistivity as a function of temperature using quantum squid design is done at a temperature of 8-80 K with an external magnetic field variation of 0, 3, 6, and 8.5 Tesla. The resistivity measurements as a function of the external magnetic field from 0 to 0.7600 Tesla performed at room temperature using a four-point probe. At the same temperature, the greater the external magnetic field, the greater its magnetoresistance. For the same external magnetic field, increasing the temperature will decrease magnetoreistance.Keywords: external magnetic field, squid quantum, magnetoresistance AbstrakTelah kami lakukan pengukuran terhadap resistiviti sebagai fungsi suhu dengan besar medan magnet luar tertentu dan juga resistiviti sebagai fungsi medan magnet luar dalam kondisi suhu ruang untuk senyawa L0,1C0,9MnO3. Pengukuran resistivitas sebagai fungsi suhu menggunakan squid quantum desain dilakukan pada suhu 8-80 K dengan variasi medan magnet luar 0, 3, 6, dan 8,5 Tesla. Pengukuran resistivitas sebagai fungsi medan magnet luar dari 0-0,7600 Tesla dilakukan pada suhu ruang. Pada suhu yang sama, semakin besar medan magnet luar, maka semakin besar magnetoresistansi nya. Untuk medan magnet luar yang sama, semakin bertambah suhunya maka magnetoreistansi akan semakin berkurang.Katakunci: medan magnet luar, squid quantum, magnetoresistansiÂ