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  • World Scientific Pub Co Pte Ltd  (4)
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  • World Scientific Pub Co Pte Ltd  (4)
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  • 1
    Online Resource
    Online Resource
    World Scientific Pub Co Pte Ltd ; 2009
    In:  International Journal of Modern Physics B Vol. 23, No. 16 ( 2009-06-30), p. 3417-3427
    In: International Journal of Modern Physics B, World Scientific Pub Co Pte Ltd, Vol. 23, No. 16 ( 2009-06-30), p. 3417-3427
    Abstract: We examine the doping dependence of SC gap (Δ) and chemical potential (μ) of the hole-doped cuprates by using the Fulde model. It is assumed that SC arises due to BCS pairing mechanism in lattices of Cu–O planes. The expression for SC, AFM, and doping concentration are calculated analytically by using the Green function technique of D. N. Zubarev. The value of SC gap (Δ) and chemical potential (μ) are solved self-consistently for different model parameters. The variation of critical temperature and chemical potential with doping are also studied.
    Type of Medium: Online Resource
    ISSN: 0217-9792 , 1793-6578
    RVK:
    Language: English
    Publisher: World Scientific Pub Co Pte Ltd
    Publication Date: 2009
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  • 2
    Online Resource
    Online Resource
    World Scientific Pub Co Pte Ltd ; 2013
    In:  International Journal of Modern Physics B Vol. 27, No. 14 ( 2013-06-10), p. 1350059-
    In: International Journal of Modern Physics B, World Scientific Pub Co Pte Ltd, Vol. 27, No. 14 ( 2013-06-10), p. 1350059-
    Abstract: In this communication we report the interplay of the normal electron-phonon (EP) interaction, dynamic Jahn–Teller (DJT) distortion and superconductivity in high temperature superconductors in presence of a static lattice strain. This model consists of a degenerate two orbital band separated by Jahn–Teller (JT) energy modified by the DJT interaction in the conduction band. The superconductivity is assumed to be s-wave type present in the same band. The interaction Hamiltonian is solved by Green's function method and a modified BCS gap equation is obtained with a modified conduction band energy [Formula: see text] and modified BCS order parameter [Formula: see text] with α = 1, 2 designating the two orbitals. This interplay displays some new interesting results which are different from the effect of the static lattice strain on superconducting (SC) order parameter. The interplay is studied by varying the normal EP coupling, the DJT coupling, the SC coupling, the phonon vibration frequency, the phonon wave vector and other model parameters of the system.
    Type of Medium: Online Resource
    ISSN: 0217-9792 , 1793-6578
    RVK:
    Language: English
    Publisher: World Scientific Pub Co Pte Ltd
    Publication Date: 2013
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  • 3
    In: International Journal of PIXE, World Scientific Pub Co Pte Ltd, Vol. 13, No. 03n04 ( 2003-01), p. 149-161
    Abstract: As part of the study of trace elemental analysis of ancient Indian coins, twenty-five coins belonging to medieval period (11 th -14 th century A.D) and fifty-nine coins belonging to Kusanas (78-250 A.D) from India have been analysed using Proton Induced X-ray Emission (PIXE) technique. The elements S , Ca , Fe , Cu , Ag , Sn , Pb were detected in 11 th -14 th century A.D. coins while elements namely S , Cl , K , Ca , Ti , Cr , Mn , Fe , Ni , Cu , As and Zn were detected in most of the Kusanas coins. Based on the elemental analysis different hypotheses put forward in the earlier literature were examined. The presence of Pb determined in medieval period coins does not rule out the utilization of local source of silver extracted from argentiferous galena instead of the Faranjal mines of Afghanistan as normally accepted. From the consistent concentration of Ag in these coins despite the change of Kingdoms it is confirmed that beside the rulers the commercial communities had a great influence in the currency of medieval period. This is the first attempt where reasonable number of ancient coins belonging to different periods were analysed by modern non destructive multi-elemental technique such as PIXE and has put the importance of the elemental analysis of ancient Indian coins in the proper perspective.
    Type of Medium: Online Resource
    ISSN: 0129-0835 , 1793-6616
    Language: English
    Publisher: World Scientific Pub Co Pte Ltd
    Publication Date: 2003
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  • 4
    Online Resource
    Online Resource
    World Scientific Pub Co Pte Ltd ; 2003
    In:  Surface Review and Letters Vol. 10, No. 02n03 ( 2003-04), p. 365-371
    In: Surface Review and Letters, World Scientific Pub Co Pte Ltd, Vol. 10, No. 02n03 ( 2003-04), p. 365-371
    Abstract: The native oxide on the rolled aerospace aluminum alloy 7475-T7651 was characterized using a variety of different techniques, including X-ray Photoelectron Spectrometry (XPS), Auger Electron Spectrometry (AES), Transmission Electron Microscopy (TEM), Electron Energy Loss Spectrometry (EELS), Glow Discharge Optical Emission Spectrometry (GDOES), and Rutherford Backscattered Spectrometry (RBS). All techniques revealed that the native oxide layer is magnesium-rich and is probably a mixture of magnesium and aluminum–magnesium oxides. 1 The oxide layer was found to be of nonuniform thickness due to the rolling process involved during the manufacture of this sheet alloy; this complicates analysis using techniques which have poor spatial resolution. Direct thickness measurement from cross-sectional TEM reveals an oxide thickness which varies between 125 and 500 nm. This large variation in thickness was also evident from GDOES and AES depth profiles as well as the RBS data. Both XPS and RBS also show evidence for the presence of heavy metals in the oxide.
    Type of Medium: Online Resource
    ISSN: 0218-625X , 1793-6667
    Language: English
    Publisher: World Scientific Pub Co Pte Ltd
    Publication Date: 2003
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