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The dynamics of the flux lattice in the mixed state of strongly type-II superconductor near the upper critical field H c 2 ( T ) subjected to ac field and interacting with a periodic array of short-range pinning centers (nanosolid) is considered. The superconductor in a magnetic field in the...
Training effect in exchange-bias systems consists of a variation in coercivity and symmetry between the first reversal after field cooling and the following loops. It has been shown, in the frame of a two-dimensional coherent-rotation approach, that training might be explained in terms of an...
A systematic study of magnetoresistance and dc magnetization was conducted in polycrystalline ( Ru 1 − x Ir x ) Sr 2 GdCu 2 O 8 (Ru,Ir)-1212 compounds, for 0 ≤ x ≤ 0.15 . We found that a deviation from linearity in the normal-state electrical resistivity ( ρ ) curves for temperatures below...
It is argued that Otero-Leal Phys. Rev. B 79 , 060401 ( 2009 ) wrongly identified the coefficient at the second-order term of the Arrott equation with the coefficient at the quartic term of the Landau expansion, therefore deriving unsupported conclusions on the phase diagram of MnSi.
With Monte Carlo methods, we investigate the relaxation dynamics of a domain wall in the two-dimensional random-field Ising model with a driving field. The short-time dynamic behavior at the depinning transition is carefully examined, and the roughening process of the domain wall is observed....
We propose that the experimentally observed resistivity upturn of cuprates at low temperatures may be explained by properly accounting for the effects of disorder in a strongly correlated metallic host. Within a calculation of the dc conductivity using real-space diagonalization of a Hubbard...
We report the observation of pressure-induced changes in the electronic structures of La 1 − x Sr x MnO 3 (LSMO) by hard x-ray photoemission spectroscopy. Application of compressive and tensile strains results in the formation of a gap at the Fermi level ( E F ) and suppression of spectral...
We report here highly accurate ultrasonic measurements on ultrapure polycrystalline cerium up to 1 GPa. By simultaneously fitting the complete measured data set, bulk and shear moduli have been deduced without any independent input. We observe a maximum in the pressure evolution of the bulk...
Three powder samples of solid isotopic solutions PdD 1 − x H x with x = 0.050 , 0.072, and 0.091 are prepared under high pressure, and the spectra of their optical vibrations are studied by inelastic neutron scattering at ambient pressure and 5 K using the high-luminosity IN1-BeF spectrometer...
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