• R G Kulkarni

      Articles written in Pramana – Journal of Physics

    • Coulomb effect in rotating nuclei in the Thomas-Fermi approach

      K Andhradev R G Kulkarni

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      The effect of nuclear Coulomb potential in rotating nuclei has been studied in the Thomas-Fermi approach. The numerical calculations of typical rotating nuclei show that Coulomb potential plays an important role in the rotational mass regions 150–190 and >224.

    • L-shell internal excitation accompanyingL-capture

      R G Kulkarni

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      TheL-shell internal excitation accompanyingL-capture has been treated relativistically by the use of hydrogenic wave functions. Numerical calculations for the nuclides37Ar,55Fe,77Ge,131Cs,157Tb,165Er,179Ta and193Pt have been performed for the first-time. The present calculations show that doubleLi-hole production probability decreases with increasing atomic number and it is almost independent of transition energy for a particular shell. Possible experiments to detect this phenomenon in atoms for whichK-K processes are energetically forbidden are discussed briefly.

    • Enhanced temperature-independent magnetoresistance below the metal-insulator transition temperature of epitaxial La0.2Nd0.4Ca0.4MnO3 thin films

      Darshan C Kundaliya A A Tulapurkar J John R Pinto R G Kulkarni

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      Epitaxial La0.2Nd0.4Ca0.4MnO3 thin films have been deposited at 800°C on LaAlO3 substrate using pulsed laser deposition technique. The structural and magnetotransport properties of the films have been studied. The sharp peak in the temperature dependence of the resistance corresponding to metal-to-insulator transition (Tp) has been observed at a temperature of Tp=82 K, 97 K and 110 K for 0 Oe, 20 kOe and 40 kOe magnetic fields, respectively. The film exhibits a large nearly temperature-independent magnetoresistance around 99% in the temperature regime below Tp. The zero field-cooled (ZFC) and field-cooled (FC) magnetization data at 50 Oe shows irreversibility between the ZFC and FC close to the ferromagnetic transition temperature Tc=250 K. The ZFC temperature data of the film displays ferromagnetic behavior for higher temperature regime Tc=250 K>T>Tp=82 K, and a decrease in magnetization with decreasing temperature up to 5 K below 82 K exhibiting a sort of antiferromagnetic behavior in the low temperature regime (T<82 K=Tp=TN).

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