Research Papers (Prof. C.N.R. Rao): Recent submissions

Now showing items 161-180 of 877

Pressure-induced shift of the photoluminescence band in single crystals of buckminster fullerene C60 and its implications for superconductivity in doped samples

Sood, A K; Chandrabhas, N; Muthu, D V S; Jayaraman, A; Kumar, N; Krishnamurthy, H R; Pradeep, T; Rao, C N R (Pergamon-Elsevier Science Ltd, 1992-01)

We report the first observation of a large pressure-induced red-shift of the photoluminescence band in single crystals of C60 and the associated colour change of the sample from red to black at 3.2 GPa. Interpreting the ...
Charge-ordering in thin films of bilayered rare earth manganates

Parashar, S; dos Santos, A Moreira; Raju, A R; Lange, F F; Cheetham, A K; Rao, C N R (Elsevier Science Ltd, 2000-12)

Thin films of bilayered manganates of the formula LnSr(2)Mn(2)O(7) (Ln=rare-earth), deposited on LaAlO3(100) substrates by nebulized spray pyrolysis, show charge-ordering transitions in the resistivity data. The transition ...
A comparative study of the interaction of nickel clusters with buckminsterfullerene, C60, and graphite

Vijayakrishnan, V; Santra, A K; Seshadri, Ram; Nagarajan, R; Pradeep, T; Rao, C N R (Elsevier Science BV, 1992-02-01)

Interaction of nickel deposited on multilayer films of C60 has been investigated in comparison with that on amorphized graphite by employing photoemission spectroscopy. It is shown that unlike with graphite, Ni interacts ...
Ultra-thin crystalline films of ZnS and PbS formed at the organic-aqueous interface

Kalyanikutty, K P; Gautam, Ujjal K; Rao, C N R (Elsevier BV, 2006-03)

Ultra-thin films of ZnS have been prepared by the reaction of zinc cupferronate or zinc stearate in a toluene solution with an aqueous solution of Na2S. The films have been examined by electron microscopy and other techniques. ...
Superconductivity of La2−ySryCu1−xNixO4+δ (y = 0.1, 0.2; 0 ≤ x ≤ 0.5) The hole-compensating effect of Ni

Bhat, V; Rao, C N R; Honig, J M (Elsevier Science BV, 1992-02-01)

Magnetization measurements below 50 K on ceramic La2−ySryCu1−xNixO4+δ (y = 0.1, 0.2; 0≤x≤0.5) show a progressive diminution of superconducting properties with increasing x. The larger suppressive action of Ni in the y=0.1 ...
CMR and related properties of single crystals of cation-deficient LaMnO3

Sudheendra, L; Raju, A R; Rao, C N R (Elsevier Science Ltd, 2000-12)

Single crystals of LaMnO3, La1−xMnO3 (x=0, 0.04, 0.1) and LaMn1−xO3 (x=0.1) have been grown by the floating-zone melting technique. Electrical and magnetic properties of these crystals have been examined. Only La0.9MnO3 ...
Fluorination of La2NiO4 and La2CuO4+δ

Bhat, V; Rao, C N R; Honig, J M (Pergamon-Elsevier Science Ltd, 1992-03)

We have carried out fluorination on La2NiO4 and La2CuO4+δ. Only a small fraction of fluorine enters the bulk; the rest resides on the surface. The cuprate after fluorination exhibits greater departures from tetragonal ...
Magnetoresistance in the Double Perovskite Sr2CrMoO6

Arulraj, Anthony; Ramesha, K; Gopalakrishnan, J; Rao, C N R (Academic Press Inc, 2000-11-15)

The double perovskite Sr2CrMoO6 with Cr3+-O-Mo5+ pairs is ferrimagnetic (TN=450 K), but there is considerable site disorder. The disorder appears to be responsible for the low value of magnetization. At 5 or 6 T, the ...
Structural Changes Accompanying the Spin-State Transition in LaCoO3: A variable Temperature Co-K-EXAFS Study

Arunarkavalli, T; Kulkarni, G U; Rao, C N R (Academic Press Inc, 1993-11)

Variable-temperature Co-K-EXAFS measurements establish the occurrence of two cobalt sites, probably associated with the two spin states, above 400K. The population of the two Co sites becomes equal around 670 K, at which ...
Investigations on C70H30 obtained by the Birch reduction of C70

Govindaraj, A; Rathna, A; Chandrasekhar, J; Rao, C N R (Indian Academy of Sciences, 1993-10)

Upon Birch reduction, C70 forms C70H30 as a major product. Besides reporting spectroscopic properties, we discuss the possible structures of C70H30 and suggest that the most stable structure is derived by exclusive ...
White-light sources based on composites of GaN nanoparticles with conducting polymers and nanophosphors

Chitara, Basant; Bhat, S Venkataprasad; Vivekchand, S R C; Gomathi, A; Rao, C N R (Materials Today, 2008-09)

Optical properties of nanocomposites of GaN nanocrystals, 2–4 nm in diameter, with conjugated polymers such as poly(2-methoxy,5-(2-ethylhexoxy)-1,4-phenylenevinylene (MEHPPV) as well as with phosphors nanoparticles have ...
Role Of Molecular-Reorientation In The Vitrification Of Molecular Liquids - A Monte-Carlo Study Of The Liquid And Glassy States Of 2,2-Dimethylbutane

Chakrabarti, Aparna; Yashonath, S; Rao, C N R (Elsevier Science BV, 1993-10-01)

The liquid and the glassy phases of 2,2-dimethylbutane have been investigated by isothermal isobaric ensemble Monte Carlo simulation. Thermodynamic properties and radial distribution functions for both the liquid and the ...
Modification of the multiferroic properties of YCrO3 and LuCrO3 by Mn substitution

Sahu, Jyoti Ranjan; Serrao, Claudy Rayan; Rao, C N R (Pergamon-Elsevier Science Ltd, 2008-01)

The effect of Mn substitution on the multiferroic properties of Y CrO3 and LuCrO3 has been investigated. Solid solutions of the type Y Cr1−xMnxO3 and LuCr1−xMnxO3 (x=0.0–0.3) possess orthorhombic structures with Pnma and ...
Preface - Molecular-Interactions And Relaxation In Liquids

Ratajczak, H; Rao, C N R; Bagchi, B; Barnes, A J (Elsevier Science BV, 1993-10-01)

This special issue of the Journal of Molecular Liquids is a collection of experimental, theoretical and computer simulation studies that address a variety of problems associated with dynamics and intermolecular interactions ...
Orientational glassy phases of C60 and neopentane. A Monte Carlo studystar, open

Chakrabarti, Aparna; Yashonath, S; Rao, C N R (Elsevier Science BV, 1993-11-19)

Based on an isothermal, isobaric simulation the structure and properties of the plastic crystalline phases of C60 and neopentane have been examined. Instantaneous cooling of the plastic crystalline phases of both C60 and ...
Beneficial modification of the properties of multiferroic BiFeO3 by cation substitution

Sahu, Jyoti Ranjan; Rao, C N R (Elsevier Science BV, 2007-10)

The effects of modifying the well-known multiferroic BiFeO3 by substituting Fe by Mn and Bi by La have been investigated. It is shown that both the substitutions have a favourable effect on the multiferroic properties of ...
Electronic absorption and emission spectroscopic investigations of the interaction of the fullerenes, C60 and C70, with amines and aromatic molecules

Rao, C N R; Seshadri, Ram; Govindaraj, A; Mittal, J P; Pal, H; Mukherjee, T (Elsevier Science BV, 1993-11-03)

Electronic absorption spectroscopy and fluorescence spectroscopy have been used to investigate the interaction of the fullerenes C60 and C70 with diethylaniline, and with aromatic solvents such as benzene. C60 interacts ...
Room-temperature ferromagnetism in nanoparticles of superconducting materials

Shipra, A Gomathi; Sundaresan, A; Rao, C N R (Pergamon-Elsevier Science Ltd, 2007-06)

Nanoparticles of superconducting YBa2Cu3O7-δ (YBCO) (Tc, = 91 K) exhibit ferromagnetism at room temperature while the bulk YBCO, obtained by heating the nanoparticles at high temperature (940 °C), shows a linear magnetization ...
Dependence of the Cu 2p photoemission intensities and the superconducting transition temperatures in cation-substituted derivatives of YBa2Cu3O7 and La1.8Sr0.2CuO4 on the hole concentration and related factors

Santra, A K; Sheelam, Radha Rani; Rao, C N R (Elsevier Science BV, 1992)

The relative intensity of the Cu 2p satellite in YBa2Cu3O7 compositions where Y is partially substituted by Pr or Ca or Cu by Zn, Ni or Fe decreases with increasing hole concentration, n(h), or decrease in T(c). La1.8Sr0.2CuO4 ...
Nanostructures of binary nitrides, BN, TiN and NbN prepared by the urea route

Gomathi, A; Rao, C N R (Elsevier Ltd, 2006-05-25)

By heating mixtures of H3BO3, TiCl4, and NbCl5 with urea in 1:6 molar ratios in the 900–1000 °C range, nanoparticles of BN, TiN, and NbN have been obtained, respectively. The nanoparticles are crystalline and have been ...

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