http://nopr.niscair.res.in/handle/123456789/2242 Search the Channel search http://nopr.niscair.res.in/simple-search http://nopr.niscair.res.in/handle/123456789/2714 Title: Reflectance and magneto-optical Kerr rotation in DyP <br/> <br/>Authors: Saini, Sapan Mohan; Singh, Nirpendra; Nautiyal, T; Auluck, S <br/> <br/>Abstract: The rare-earth compounds are distinguished by their unique magnetic, electric and optical properties. These are strongly correlated materials. Their highly localized 4f electrons are responsible for their large magnetic moment. Optical properties of a material can be utilized in different applications such as reflectors, filters, and X-ray masks. On the other hand, magneto-optical properties of materials are used in storage devices. The calculations of optical properties of rare-earth compound DyP using the full potential linear augmented plane wave (FPLAPW) method with inclusion of spin orbit coupling have been reported. The Coulomb-corrected local spin density approximation, i.e. LSDA+U, which is known to treat the highly correlated 4f electrons properly have been employed. The calculated optical properties are in good agreement with the measured value. The magneto-optical Kerr rotation has been reported and the values expected for DyP in the low energy range have been predicted. <br/> <br/>Page(s): 66-68 http://nopr.niscair.res.in/handle/123456789/2288 Title: Phonon interaction and variation of deformation potential with temperature and concentration in diluted Ga₍₁₋x₎MnxN quantum well <br/> <br/>Authors: Pandya, Ankur; Jha, Prafulla K <br/> <br/>Abstract: The carrier transport properties for two dimensional diluted Ga₍₁₋x₎MnxN have been calculated via electron acoustical phonon interaction on the basis of deformation potential coupling mechanism for the different concentrations of Mn (x ≤10%) at different temperatures. The acoustic phonon scattering rate increases with the energy and decreases with the manganese concentration. The contribution of acoustic phonons in the variation of resistivity for different manganese concentrations and threshold thermal energy have also been determined. The temperature and concentration both affect the acoustic phonon scattering rate. Therefore, the resistivity varies due to the effect of these on the acoustical deformation potential (ADP). <br/> <br/>Page(s): 96-99 http://nopr.niscair.res.in/handle/123456789/2287 Title: High-pressure P-V relation and Grüneisen parameter for elemental strontium <br/> <br/>Authors: Vyas, P R; Gohel, V B; Bhatt, N K; Jani, A R <br/> <br/>Abstract: The functional relationship among the thermodynamical variables for a system in equilibrium, equation of state (EOS), provides an insight to the dependence of the microscopic internal structure of the material. In this regard, we have calculated static and dynamic P-V curve for divalent fcc-Sr. Vibrational contribution to the Helmholtz free energy is evaluated within recently proposed mean-field potential (MFP) approximation with the local pseudopotential. Temperature dependence of thermodynamic Grüneisen parameter (ϒth), a quantity that enters the Mie-Grüneisen form of EOS, is also obtained. Results so obtained are in good agreement with the experimental and other theoretical estimates. Use of present coupling scheme (i.e. MFP + pseudopotential) is thus justified; which has an added benefit of computational simplicity. <br/> <br/>Page(s): 93-95 http://nopr.niscair.res.in/handle/123456789/2286 Title: Variation of electrical resistivity with temperature of liquid ternary alloys of Na-K-Rb <br/> <br/>Authors: Gajjar, P N; Mishra, S R; Jani, A R <br/> <br/>Abstract: A model potential and Ziman formulation is employed to study the temperature sensitiveness of electrical resistivity of liquid ternary alloys of Na-K-Rb. The calculated structure factors and form factors are employed for the numerical investigation of electrical resistivity for temperatures in the range 100-500ºC. The binary combinations Na-K, Na-Rb show the Nordheim parabola for increasing temperatures, but there is an exception to K-Rb alloy system. The good agreement for electrical resistivity for pure liquid metals and their binary combination is achieved. The results of electrical resistivity for the ternary combination Na-K-Rb rise with temperatures. <br/> <br/>Page(s): 89-92