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Nonlinear behavior of V–I curves at low temperatures in nanoparticles of La2/3B1/3MnO3 with B=Ca,Sr |
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| Authors: | R. D. S nchez, D. Niebieskikwiat, D. G. Lamas, A. Caneiro, L. E. Hueso, J. Rivas, F. Rivadulla,M. A. L pez-Quintela |
| Affiliation: | a Comisión Nacional de Energía Atómica-Centro Atómico Bariloche and Instituto Balseiro, 8400, Bariloche, Argentina b Depto. de Física Aplicada, Facultade de Física, Universidade de Santiago de Compostela, 15706, Santiago de Compostela, Spain c Depto. de Química Física, Facultade de Química, Universidade de Santiago de Compostela, 15706, Santiago de Compostela, Spain |
| Abstract: | We measure voltage–current curves at low temperature in La2/3B1/3MnO3 samples (B=Ca,Sr). The powder oxides were prepared by different wet-chemical routes and low calcination temperatures were used for nanoparticles formation. We studied samples prepared by three different synthesis methods: gel-combustion, urea sol–gel and liquid-mix. Although the average particle size was almost the same for all the samples (30 nm), we found different behaviors in the V–I curves depending on the synthesis route. The obtained data are analyzed in the electronic tunneling picture. |
| Keywords: | Grain boundaries Electrical resistivity Tunneling |
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