Browsing Department of Physics by Issue Date

Browsing Department of Physics by Issue Date

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  • Transition from dense Kondo to the intermediate-valence regime in the Ce (Pt1-xNix)2Si2 alloys 
    Ragel, F. C.; P de V du Plessis (Journal of Physics: Condensed Matter, 2004)
    Electrical resistivity ρ(T) measurements on polycrystalline samples of the Ce (Pt1−xNix)2Si2 system exhibit dense Kondo behaviour for alloys with . The temperature at which a maximum appears in ρ(T) shifts from Tmax = 65 ...
  • Preparation, Characterisation and Mechanical Properties of Montmorillonite Polyanyline Nanocomposites 
    Soundararajah, Q. Y.; Karunaratne, B. S. B.; Rajapakse, R. M. G. (University of Peradeniya, 2006)
    The montmorillonite (MMT) clay was intercalated with polyaniline (PANI) to prepare montmorillonite - polyaniline nanocomposites (MMT-PANI). The MMT clay was ion exchanged with H+ and dried at 120°C for 2 hours. The H+ ...
  • Competing effects by Y dilution in CeNiAl4 
    Ragel, F. C.; P de V du Plessis; A M Strydom (Solid State Communications, 2007)
    The occurrence of a maximum at a temperature T-max in the resistivity of the dense Kondo compound CeNiAl4 and in (Ce1-x,Y-x)NiAl4 alloys is investigated. Tmax (proportional to T-K, the Kondo temperature) first increases, ...
  • Electrical transport of Ce(Pt1-xNix)Ga and CePt(Ga1-yAly) alloys 
    Ragel, F. C.; P de V du Plessis; A M Strydom (ELSEVIER SCIENCE BV, 2007)
    Electrical resistivity results of Ce(Pt1-xNi)Ga and CePt(Ga1-yAl) alloys show features at low temperature indicating antiferromagnetic ordering and Kondo behaviour. The variation of Néel temperature with alloy composition ...
  • Chemical pressure and magnetic field effects in CePtGa 
    Ragel, F. C.; P de V du Plessis; A M Strydom (IOP PUBLISHING LTD, 2007)
    The antiferromagnetic Kondo compound CePtGa and the Ce(Pt1−xNix)Ga and CePt(Ga1−yAly) alloy systems have been studied by resistivity ρ(T), magnetoresistivity MR and susceptibility χ(T) measurements on polycrystalline samples ...
  • Effects of La dilution on the CePt2Si2 Kondo lattice 
    Ragel, F. C.; P de V du Plessis; A M Strydom (IOP PUBLISHING LTD, 2008)
    Electrical resistivity (ρ(T)) and magnetoresistivity (MR) measurements are presented for the (Ce1−xLax)Pt2Si2 alloy system. ρ(T) data at low temperatures for alloys in the concentrated Kondo lattice regime 0≤x≤0.2 conform ...
  • Dilution and Non-Fermi-liquid effects in the CePtIn Kondo lattice 
    Ragel, F. C.; P de V du Plessis; A M Strydom (Journal of Physics, 2009)
    Measurements of electrical resistivity (ρ(T)), magnetoresistivity (MR), magnetic susceptibility (χ(T)) and heat capacity (CP(T)) are presented for the (Ce1−xLax)PtIn alloy system of which the CePtIn parent is a known dense ...
  • Montmorillonite polyaniline nanocomposites: Preparation, characterization and investigation of mechanical properties 
    Soundararajah, Q. Y.; Karunaratne, B. S. B.; Rajapakse, R. M. G. (Mater. Chem. Phys, 2009)
    The interest in clay polymer nanocomposites (CPN) materials, initially developed by researchers at Toyota, has grown dramatically over the last decade. They have attracted great interest, both in industry and in academia, ...
  • Mechanical Properties of Poly(vinyl alcohol) Montmorillonite Nanocomposites. 
    Soundararajah, Q. Y.; Karunaratne, B. S. B.; Rajapakse, R. M. G. (J. Compos. Mater., 2010)
    The properties of polymers are greatly enhanced when they are incorporated with silicate-layered clays as they find many applications in the fields of electronics, automobile industry, packaging, and construction. In this ...
  • Kondo behaviour of the solid solution (Ce1-xLax)PtGa 
    Ragel, F. C.; P de V du Plessis; A M Strydom (Journal of Physics and Chemistry of Solids, 2010)
    The solid solution (Ce1−xLax)PtGa has been studied through X-ray diffraction, magnetization (σ(B)), magnetic susceptibility (χ(T)), electrical resistivity (ρ(T)), magnetoresistivity (MR) and heat capacity (CP(T)) measurements. ...
  • Electronic correlation effects in LnFe2Al10 (Ln = Y, Yb) 
    Strydom, A. M.; Peratheepan, P.; Sarkar, R.; Baenitz, M.; Steglich, F. (Journal of the Physical Society of Japan, 2011)
    We report on physical properties of the two new iron aluminides YFe2Al10 and YbFe2Al10. They are members of a broader rare-earth based family of intermetallics in which unusual properties have been the subject of considerable ...
  • Exact anisotropic sphere with polytropic equation of state 
    Thirukkanesh, S.; Ragel, F. C. (Pramana-Journal of Physics, 2012)
    We study static spherically symmetric spacetime to describe compact objects with anisotropic matter distribution. We express the system of Einstein field equations as a new system of differential equations using a coordinate ...
  • Competing 4f-electron dynamics in Ce(Ru1-xFex) 2Al10 (0≤x≤1.0): Magnetic ordering emerging from the Kondo semiconducting state 
    Adroja, D. T.; Hillier, A. D.; Muro, Y.; Kajino, J.; Takabatake, T.; Peratheepan, P.; Strydom, A. M.; Deen, P. P.; Demmel, F.; Stewart, J. R.; Taylor, J. W.; Smith, R. I.; Ramos, S.; Adams, M.A. (Physical Review, 2013)
    We have carried out muon spin relaxation (muSR), neutron diffraction and inelastic neutron scattering (INS) investigations on polycrystalline samples of Ce(Ru1-xFex)2Al10 (x=0, 0.3, 0.5, 0.8 and 1) to investigate the nature ...
  • A class of exact strange quark star model 
    Thirukkanesh, S.; Ragel, F. C. (Pramana-Journal of Physics, 2013)
    Static spherically symmetric space-time is studied to describe dense compact star with quark matter within the framework of MIT Bag Model. The system of Einstein’s field equations for anisotropic matter is expressed as ...
  • Fluctuations and the ferromagnetic instability in YFe2Al10: the role of Fe stoichiometry 
    Strydom, A. M.; Khuntia, P.; Baenitz, M.; Peratheepan, P.; Steglich, F. (Physica Status, 2013)
    YFe2Al10 forms in a well-ordered crystal structure, with a unique site for the magnetic atom Fe. At elevated temperatures YFe2Al10 behaves electronically as a good metal. At low temperatures on the other hand, signatures ...
  • Hypergeometric Equation in Modeling Relativistic Isotropic Sphere 
    Thirukkanesh, S.; Ragel, F. C. (International Journal of Theoretical Physics, 2014)
    We study the Einstein system of equations in static spherically symmetric spacetimes. We obtained classes of exact solutions to the Einstein system by transforming the condition for pressure isotropy to a hypergeometric ...
  • Contiguous 3d and 4f Magnetism: strongly correlated 3d electrons in YbFe2Al10 
    Khuntia, P.; Peratheepan, P.; Strydom, A. M.; Utsumi, Y.; Tsuei, K. D.; Tjeng, L. H.; Steglich, F.; Baenitz, M. (Physical Review, 2014)
    We present magnetization, specific heat, and 27 Al NMR investigations on YbFe 2 Al 10 over a wide range in temperature and magnetic field. The magnetic susceptibility at low temperatures is strongly enhanced ...
  • Anisotropic compact sphere with Van der Waals equation of state 
    Thirukkanesh, S.; Ragel, F. C. (Astrophysics and Space Science, 2014)
    We formulate a system of field equations with Van der Waals type equation of state to the Einstein field equations in spherically symmetric static spacetime to describe anisotropic compact matter and obtain a new class of ...
  • Anisotropic spheres with Van der Waals-type equation of state 
    Thirukkanesh, S.; Ragel, F. C. (INDIAN ACAD SCIENCES and SPRINGER, 2014)
    We study static spherically symmetric space-time to describe relativistic compact objects with anisotropic matter distribution and derive two classes of exact models to the Einstein–Maxwell system with a modified Van der ...
  • Strange star model with Tolmann IV type potential 
    Thirukkanesh, S.; Ragel, F. C. (Astrophysics and Space Science, 2014)
    We report a general solution in one of the gravitational potentials to the Einstein system in static spherically symmetric spacetime, modeling anisotropic strange quark matter by imposing a linear barotropic equation of ...

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