Search Results - "Fondado, A."

Dielectric response of the charge-ordered two-dimensional nickelate La1.5Sr0.5NiO4 by Rivas, J., Rivas-Murias, B., Fondado, A., Mira, J., Señarís-Rodríguez, M. A.

“…We report the dielectric response of La1.5Sr0.5NiO4, a system that experiences charge ordering above room temperature (TCO=480K) and a rearrangement of its…”
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Structural transformation induced by magnetic field and "colossal-like" magnetoresistance response above 313 K in MnAs by Mira, J, Rivadulla, F, Rivas, J, Fondado, A, Guidi, T, Caciuffo, R, Carsughi, F, Radaelli, P G, Goodenough, J B

“…MnAs exhibits a first-order phase transition from a ferromagnetic, high-spin metal hexagonal phase to a paramagnetic, lower-spin insulator orthorhombic phase…”
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Low field magnetoresistance effects in fine particles of La0.67Ca0.33MnO3 perovskites by RIVAS, J, HUESO, L. E, FONDADO, A, RIVADULLA, F, LOPEZ-QUINTELA, M. A

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A new approach to diffusion-like relaxation processes by Fondado, A., Mira, J., Rivas, J.

“…We measured the time decay of the electric field in two dielectric non-crystalline solids and the data were analyzed in the framework of a new theoretical…”
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Increase of the dielectric constant near a magnetic phase transition in La0.5Ca0.5MnO3 by Botta, P M, Mira, J, Fondado, A, Rivas, J

“…The dielectric response of polycrystalline La0.5Ca0.5MnO3 as a function of frequency and temperature was studied. The semiconducting nature of this oxide gave…”
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Scale properties as a basis of power law relaxation processes by Fondado, A., Mira, J., Rivas, J.

“…Computer simulations of first-order relaxation processes show that the spatial configurations of the system acquire an invariant shape once the stationary…”
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Study of the Dielectric Properties of the Perovskite LaMn0.5Co0.5O3-δ by Yáñez-Vilar, S., Castro-Couceiro, A., Rivas-Murias, B., Fondado, A., Mira, J., Rivas, J., Señarís-Rodríguez, M. A.

“…Polycrystalline samples of the charge ordered mixed oxide LaMn0.5Co0.5O3−δ (TCO = 400 K) have been prepared by the nitrate decomposition method. These samples…”
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Synthesis, characterization, magnetism and transport properties of Nd1−xSrxCoO3 perovskites by Fondado, A., Breijo, M.P., Rey-Cabezudo, C., Sánchez-Andújar, M., Mira, J., Rivas, J., Señarı́s-Rodrı́guez, M.A.

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Magnetotransport in Gd1-xSrxCoO3 (0 < x ≤ 0.30) Perovskites by REY-CABEZUDO, C., SáNCHEZ-ANDúJAR, M., MIRA, J., FONDADO, A., RIVAS, J., SEñARíS-RODRíGUEZ, M. A.

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Experimental study of charge ordering transition in Pr0.67Ca0.33MnO3 by Jardón, C., Rivadulla, F., Hueso, L.E., Fondado, A., López-Quintela, M.A., Rivas, J., Zysler, R., Causa, M.T., Sánchez, R.D.

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High Dielectric Constant in the Charge-ordered Manganese Oxide CaMn7O12 by Vilar, S. Yáñez, Castro-Couceiro, A., Rivas-Murias, B., Fondado, A., Mira, J., Rivas, J., Señarís-Rodríguez, M. A.

“…The dielectric properties of mixed‐oxide CaMn7O12 are reported. This compound exhibits a high dielectric constant at room temperature (ε′r> 104), for…”
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Dielectric behavior of La1-xCaxMnO3 (0.4 ≤ x ≤ 0.5) by Fondado, A., Mira, J., Botta, P. M., Rivas, J.

“…In this work the dielectric behavior of semiconducting La-manganites in an intermediate Ca-doping regime is studied. Ceramic samples were prepared by…”
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Strong ferro-antiferromagnetic competition and charge ordering in Pr0.67Ca0.33MnO3 by RIVADULLA, F, LOPEZ-QUINTELA, M. A, HUESO, L. E, JARDON, C, FONDADO, A, RIVAS, J, CAUSA, M. T, SANCHEZ, R. D

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Transport properties in Gd doped La2/3Ca1/3MnO3 by Hueso, L.E., Sande, P., Rivadulla, F., Fondado, A., Rivas, J., López-Quintela, M.A.

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Dielectric characterization of the charge-ordered nickel oxides: La3/2Sr1/2NiO4 and La5/3Sr1/3NiO4 by Señarís-Rodríguez, M. A., Fondado, A., Mira, J., Rivas-Murias, B., Rivas, J.

“…In this work, we study the dielectric properties of the layered perovskites La3/2Sr1/2NiO4 and La5/3Sr1/3NiO4 in the frequency range 20 Hz- 1 MHz and in the…”
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Power-law decay in first-order relaxation processes by Fondado, A., Mira, J., Rivas, J.

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Spin dynamics of Cr-doped La0.67Ca0.33MnO3 in the paramagnetic regime by Rivadulla, F., Causa, M.T., Hueso, L.E., Sande, P., Fondado, A., Rivas, J., Lopez-Quintela, M.A.

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Application of an algorithm for fitting exponential functions to magnetic relaxation phenomena by Fondado, A., Rivas, J.

“…A procedure is described for the calculation of the amplitudes and times which fit a sequence of data items, equally spaced in time, to a discrete sum of…”
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Magnetic-field-dependent dielectric constant in La2∕3Ca1∕3MnO3 by Rivas, J., Mira, J., Rivas-Murias, B., Fondado, A., Dec, J., Kleemann, W., Señarís-Rodríguez, M. A.

“…We report a rather high dependence of the dielectric permittivity on the magnetic field in La2∕3Ca1∕3MnO3. The variation is maximum at around 270K, little…”
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Particle size reduction: A way to enhanced dielectric propertiesof magnetocapacitive La 2 / 3 Ca 1 / 3 MnO 3 by Yáñez-Vilar, S., Mira, J., Sánchez-Andújar, M., Castro-García, S., Fondado, A., Rivas, J., Señarís-Rodríguez, M. A.

“…We report the optimization of the dielectric properties of La 2 / 3 Ca 1 / 3 MnO 3 . This is achieved by synthesizing this material with small particle size,…”
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