The Hall resistivity xy , resistivity xx , and magnetization of three metallic ferromagnets are investigated as a function of magnetic field and temperature. The three ferromagnets, EuFe4Sb12 Tc 84 K , Yb14MnSb11 Tc 53 K , and Eu8Ga16Ge30 Tc 36 K are Zintl compounds with carrier concentrations between 1 1021 and 3.5 1021 cm−3. The relative decrease in xx below Tc xx Tc / xx 2 K is 28, 6.5, and ...

Three-dimensional geoelectrical surveys are widely used to map the subsurface in areas with complex geology. Field survey methods using offset pole–dipole and dipole–dipole arrays have been proposed large efficiently. However, it has found that negative apparent resistivity values sometimes encountered contrasts, particularly when offsets between current electrodes potential dipoles used. The v...

The present study explores the applicability and effectiveness of an optimization technique applied to electrical resistivity tomography data. procedure is based on Jacobian matrix, where most sensitive measurements are selected from a comprehensive data set enhance least resolvable parameters reconstructed model. Two existing inversion programs in two three dimensions modified incorporate this...