90 research outputs found
Static critical exponents of the ferromagnetic transition in spin glass re-entrant systems
The static critical phenomenology near the Curie temperature of the
re-entrant metallic alloys Au_0.81Fe_0.19, Ni_0.78Mn_0.22, Ni_0.79Mn_0.21 and
amorphous a-Fe_0.98Zr_0.08 is studied using a variety of experimental
techniques and methods of analysis. We have generally found that the values for
the exponents alpha, beta, gamma and delta depart significantly from the
predictions for the 3D Heisenberg model and are intermediate between these
expectations and the values characterizing a typical spin glass transition.
Comparing the exponents obtained in our work with indices for other re-entrant
systems reported in the literature, a weak universality class may be defined
where the exponents distribute within a certain range around average values.Comment: 17 pages, 11 figure
Magnetoresistance in Sn-Doped In2O3Nanowires
In this work, we present transport measurements of individual Sn-doped In2O3nanowires as a function of temperature and magnetic field. The results showed a localized character of the resistivity at low temperatures as evidenced by the presence of a negative temperature coefficient resistance in temperatures lower than 77 K. The weak localization was pointed as the mechanism responsible by the negative temperature coefficient of the resistance at low temperatures
Permissiveness of bovine epithelial cells from lung, intestine, placenta and udder for infection with Coxiella burnetii
Equivalence of Gyn GEC-ESTRO guidelines for image guided cervical brachytherapy with EUD-based dose prescription
Ageing in relation to skeletal muscle dysfunction: redox homoeostasis to regulation of gene expression
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