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Abstract pips conference suci 26 sept
- 1. The 4th Padjadjaran International Physics Symposium 2019 Harris Hotel, Bandung , 13-14 November 2019 Department of Physics Universitas Padjadjaran Inter-grain Resistivity of La2-xSrxCuO4 Nanoparticles Evaluated by Four Point Probe Method Suci Winarsih1,2,3, Faisal Budiman4,†, Hirofumi Tanaka4, Takayuki Goto5, Tadashi Adachi5, Bambang Soegijono2, Budhy Kurniawan2,a, and Isao Watanabe1,2,3,b 1Meson Science Laboratory, RIKEN (The Institute of Physical and Chemical Research), 2-1 Hirosawa, Wako 351-0198, Japan 2Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Indonesia, Depok 16424, Indonesia 3Department of Condensed Matter Physics, Graduate School of Science, Hokkaido University, Kita 10, Nisi 8, Kita-ku, Sapporo 060-0810, Japan 4Department of Human Intelligence Systems, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu, Kitakyushu 808-0196, Japan 5Department of Engineering and Applied Sciences, Faculty of Science and Technology, Sophia University, 7-1 Kioi-cho, Chiyoda-ku, Tokyo 102-8554, Japan abkuru@fisika.ui.ac.id, bnabedon@riken.jp Abstract. A ferromagnetic-like phase appears in underdoped La2-xSrxCuO4 (LSCO) when the particle size is 113 nm. Meanwhile, ferromagnetic fluctuations were reported to be observed in the heavily over-doped region of bulk LSCO. The particle size of 113 nm is still big to reveal nano-sized effect. Therefore, we are investigating the particle size dependence of electrical properties of LSCO for x = 0, 0.05, and 0.20 with smaller particle size. Samples were synthesized by the sol-gel method. The final product was in the powder form and its particle size was controlled within a couple of ten nanometer range. Pressed-powder samples were evaluated by resistivity measurement using the four-point probe method. We utilized gold wires with a thickness of 7~10 µm as electrodes and sliver paste to attach the gold wire to the samples. To decrease the contact resistance of the samples, the indium solder was used to ensure the wire contact. We confirmed that the contact resistivity was in the order of hundred ohm. The temperature dependence of resistivity can be analyzed by variable range hopping model even though the resistivity values showed 103 times higher than those observed in bulk LSCO. We discussed possible scenario to describe the results. Keywords: four-point probe; indium solder; inter-grain; nanoparticles; resistivity. † Present address: School of Electrical Engineering, Telkom University, Bandung 40257, Indonesia.