3,292 research outputs found
Anisotropic Compacts Stars on Paraboloidal Spacetime with Linear Equation of State
New exact solutions of Einstein's field equations (EFEs) by assuming linear
equation of state, where is the radial
pressure and is the surface density, are obtained on the background
of a paraboloidal spacetime. By assuming estimated mass and radius of strange
star candidate 4U 1820-30, various physical and energy conditions are used for
estimating the range of parameter . The suitability of the model for
describing pulsars like PSR J1903+327, Vela X-1, Her X-1 and SAX J1804.3658 has
been explored and respective ranges of , for which all physical and
energy conditions are satisfied throughout the distribution, are obtained.Comment: 10 pages, 12 figures, 1 tabl
Fe-spin reorientation in PrFeAsO : Evidences from resistivity and specific heat studies
We report the magnetic field dependence of resistivity () and specific
heat () for the non-superconducting PrFeAsO compound. Our study shows a
hitherto unobserved anomaly at in the resistivity and specific heat
data which arises as a result of the interplay of antiferromagnetic (AFM) Pr
and Fe sublattices. Below the AFM transition temperature (), Pr
moment orders along the crystallographic c axis and its effect on the iron
subsystem causes a reorientation of the ordered inplane Fe moments in a
direction out of the plane. Application of magnetic field introduces
disorder in the AFM Pr sublattice, which, in turn, reduces the out-of-plane
Pr-Fe exchange interaction responsible for Fe spin reorientation. Both in
() and curves, the peak at broadens with the
increase of due to the introduction of the disorder in the AFM Pr
sublattice by magnetic field. In () curve, the peak shifts towards
lower temperature with and disappears above 6 T while in curve
the peak remains visible up to 14 T. The broadening of the anomaly at
in with increasing further confirms that magnetic
field induces disorder in the AFM Pr sublattice.Comment: 8 pages, 10 Figure
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