The gigantic reduction of the electric resistivity under the applied magnetic field, CMR effect, is now widely accepted to appear in the vicinity of the insulator to metal transition of the perovskite manganites. Recently, we have discovered the first order transition from ferromagnetic metal to insulator in La0.88Sr0.12MnO3 of the CMR manganite. This phase transition induces the tremendous inc...

Results of resistivity and Hall effect measurements in Lal_.Ca.Co03 (0.1< z <0,5) epitaxkd films and ceramics are presented. The spontaneous Hall effect in Lal_ZCasCo03 (LCCO) is observed for ferromagnetic samples with z ~0.2. The Hall effect is largest near the magnetic percolation threshold z=O.2. For 2=0.2, tains a large value may be applied to the Iow-field slope of the Hall resistivity, PZ...

Despite of the great scientific and technology interest, highly ordered full-Heusler L21-Co2MnAl films have remained a big challenge in terms of the availability and the electrical transport. Here we report the controllable growth and the intriguing transport behavior of epitaxial L21-Co2MnAl films, which exhibit a low-temperature (T) resistivity upturn with a pronounced T1/2 dependence, a robu...

A thin, insulating layer with high electrical resistivity is vital to achieving high performance of powder magnetic cores. Using layer-by-layer deposition of silica nanosheets or colloidal silica over insulating layers composed of strontium phosphate and boron oxide, we succeeded in fabricating insulating layers with high electrical resistivity on iron powder particles, which were subsequently ...

Recent numerical simulations of magnetic reconnection in two dimensions have shown that, when the resistivity is strongly localized, the reconnection region develops a Petschek-like structure, with the width of the inner diffusion region being of the order of the resistivity localization scale. In this paper, we combine this fact with a realistic model for locally-enhanced anomalous resistivity...

Metal-insulator granular film is technologically important for microwave applications. It has been challenging to obtain simultaneous high electrical resistivity and large saturation magnetization due to the balance of insulating non-magnetic and metallic magnetic components. FeAlO granular films satisfying both requirements have been prepared by pulsed laser deposition. The as-deposited film e...

We study the resistivity T of PrOs4Sb12 and Pr0.7La0.3Os4Sb12 in magnetic fields between 2.7 and 16 T and at temperatures 20 mK T 1 K. PrOs4Sb12 is known to exhibit field-induced antiferroquadrupolar AFQ order while there is no evidence for such order in the specific heat of Pr0.7La0.3Os4Sb12. We find the resistivity of Pr0.7La0.3Os4Sb12 to be consistent with the accepted crystalline electric f...

Aims. We measure the turbulent resistivity in the nonlinear regime of the MRI, and evaluate the turbulent magnetic Prandtl number. Methods. We perform a set of numerical simulations with the Eulerian finite volume codes Athena and Ramses in the framework of the shearing box model. We consider models including explicit dissipation coefficients and magnetic field topologies such that the net magn...