108 citations · 260 across the 6 of their papers we have counts for
6 papers
Magnetic field-dependent dielectric constant in La2/3Ca1/3MnO3
J. Rivas, J. Mira, B. Rivas-Murias +4
We report a rather high dependence of the dielectric permittivity on the magnetic field in La2/3Ca1/3MnO3. The variation is maximum at around 270 K, little above the Curie temperat…
Power-law decay in first-order relaxation processes
A. Fondado, J. Mira, J. Rivas
Starting from a simple definition of stationary regime in first-order relaxation processes, we obtain that experimental results are to be fitted to a power-law when approaching the…
Dielectric response of the charge-ordered two-dimensional nickelate La1.5Sr0.5NiO4
J. Rivas, B. Rivas-Murias, A. Fondado +2
We are reporting the dielectric response of La1.5Sr0.5NiO4, a system that presents a charge-ordered state above room temperature and a rearrangement of its charge-order pattern in…
Field-induced magnetic anisotropy in La0.7Sr0.3CoO3
J. Mira, J. Rivas, M. Vazquez +3
Magnetic anisotropy has been measured for the ferromagnetic La0.7Sr0.3CoO3 perovskite from an analysis of the high-field part of the magnetization vs. field curves, i.e., the magne…
Ultrasonic evidence of an uncorrelated cluster formation temperature in manganites with first-order magnetic transition at T_C
J. Mira, J. Rivas, A. Moreno-Gobbi +2
Ultrasonic attenuation and phase velocity measurements have been carried out in the ferromagnetic perovskites La_{2/3}Ca_{1/3}MnO_3 and La_{2/3}Sr_{1/3}MnO_3. Data show that the tr…
Structural transformation induced by magnetic field and colossal magnetoresistance response above 313 K in MnAs
J. Mira, F. Rivadulla, J. Rivas +5
MnAs exhibits a first-order phase transition from a ferromagnetic, high-spin metal NiAs-type hexagonal phase to a paramagnetic, lower-spin insulator MnP-type orthorhombic phase at…