We evaluate the quasielastic double differential neutrino cross sections obtained in a phenomenological model based on the superscaling behavior of electron scattering data. We compare our results with the recent experimental data for neutrinos of MiniBooNE and estimate the contribution of the vector meson-exchange currents in the 2p-2h sector.DGI FIS2008-01143 y FIS2008-04189INFN–Ministerio de Educación y Ciencia FPA2008-03770-E-INFN y ACI2009-1053Spanish Consolider-Ingenio 2000 programmed CPAN CSD2007-00042U.S. Department of Energy DE-FC02-94ER4081
We have used a perpendicular-current spin-polarization detector, in the form of a Permalloy-based exchangebiased spin valve, to measure the length scale for penetration of quasiparticles through superconducting-Nb thin films under diffusive transport conditions. In the low-temperature limit, this penetration length is ϳ16 nm, comparable to the estimated ''dirty-limit'' zero-temperature coherence length of our Nb films.
We report magnetic and magnetoresistance (MR) measurements in the current-in-plane (CIP) and current-perpendicular-to-the-plane (CPP) geometries of multilayers and spin-valve structures based on the predicted half-metallic (100% spin-polarized) ferromagnetic Heusler alloy NiMnSb. Multilayers of the form [NiMnSb/Cu]×10, as well as a trilayer spin valve of the form [NiMnSb/Cu/Y] (Y=Ni80Fe20 and NiMnSb/FeMn) have been grown using a low-rate, low-pressure sputtering deposition technique. The multilayers do not show evidence of antiferromagnetic coupling between the NiMnSb layers, and the measured CPP magnetoresistance is 4.5% at 4.2 K. NiMnSb/Cu/NiFe spin valves and NiMnSb/Cu/NiMnSb/FeMn quasispin-valves adopt more closely antiparallel alignments of adjacent magnetic layer magnetizations, and CPP MR ratios as high as 7.2% are measured at 4.2 K. Although these CPP MRs are larger than the CIP MRs for similar samples, the largest CPP MR observed is still smaller than expected for a 100% spin-polarized material.
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