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Profiles In Research

Rao, C N R (Current Science Association, 1995-05)

Rao, C N R; Kartha, V B; Govil, G (Pergamon-Elsevier Science Ltd, 1992-11)

A Perspective On The Metal-Nonmetal Transition

Edwards, Peter P; Johnston, Roy L; Hensel, Friedrich; Rao, C N R; Tunstall, David P (Academic Press Inc, 1999)

High-pressure study of Fe304 through the Verwey transition

Ramasesha, Sheela K; Mohan, Murali; Singh, A K; Honig, J M; Rao, C N R (American Physical Society, 1994-11-01)

The thermopower (TEP) and electrical resistance of stoichiometric Fe3O4 crystals have been measured up to pressures of 6 GPa over the temperature range of 80–160 K. The resistance decreases markedly with increasing pressure ...

Giant Magnetoresistance Phenomenon in Manganates

Rao, C N R (WILEY-VCH Verlag GmbH, 1996-12)

The discovery of giant magnetoresistance (GMR) in rare earth manganates of the general formula Ln(1-x)A(x)MnO(3) (Ln = rare earth, A = divalent cation) has aroused much interest not only because of its technological ...

The Blackett Memorial Lecture, 1991 : Chemical Insights into High-Temperature Superconductors

Rao, C N R (Royal Society London, 1991-09-16)

The high-temperature superconductors are complex oxides, generally containing two-dimensional CuO2 sheets. Various families of the cuprate superconductors are described, paying special attention to aspects related to oxygen ...

Effects of large cation size-disorder on the magnetic properties of the rare earth cobaltates, La0.5Ba0.5CoO3

Kundu, Asish K; Rao, C N R (Elsevier, 2005-05)

Magnetic and electrical properties of Ln0.5Ba0.5CoO3−δ with Ln=Dy and Er have been investigated to examine the effects of large cation size-disorder. While the Dy compound shows the small magnetic anomaly around 290 K just ...

Investigations Of V2O5—Based LPG sensors

Raju, A R; Seshadri, Kanan; Rao, C N R (Elsevier Science BV, 1992-11)

Sensor characteristics of V2O5 dispersed on oxide supports such as Al2O3, TiO2 and ZrO2 with respect to various gases and vapours including liquefied petroleum gas (LPG) have been investigated. Of all the systems studied, ...

Structural changes and related effects due to charge ordering in Nd0.5Ca0.5MnO3

Vogt, T; Cheetham, A K; Mahendiran, R; Raychaudhuri, A K; Mahesh, R; Rao, C N R (American Physical Society, 1996-12-01)

Charge ordering in L(1-x)A(x)MnO(3) (L=rare earth, A=Ca,Sr) depends strongly on the width of the e(g) band or on the average radius of the A-site cations, 〈rA〉. Investigations of Nd0.5Ca0.5MnO3 with a small 〈rA〉 show ...

Electrical transport, magnetism, and magnetoresistance in ferromagnetic oxides with mixed exchange interactions: A study of the La0.7Ca0.3Mn12xCoxO3 system

Gayathri, N; Raychaudhuri, A K; Tiwary, S K; Gundakaram, R; Arulraj, Anthony; Rao, C N R (American Physical Society, 1997-07-15)

In this paper we report the results of an extensive investigation of the La0.7Ca0.3Mn1-xCoxO3 system. Substitution of Mn by Co dilutes the double-exchange (DE) mechanism and changes the long range ferromagnetic order of ...

Temperature-dependent vacuum tunneling spectroscopy of rare-earth manganates showing colossalmagnetoresistance and charge ordering

Biswas, A; Raychaudhuri, A K; Arulraj, A; Rao, C N R (Springer Verlag, 1998-03)

We report here the results of vacuum tunneling spectroscopy of race-earth manganates which show colossal magnetoresistance (CMR) and charge ordering (CO). Three samples with different hole concentrations and average A site ...

A comparative study of the electron- and hole-doped compositions of single crystalline Nd1-x CaxMnO3 (x = 0.6 and 0.4) by Brillouin scattering

Seikh, Md Motin; Narayana, Chandrabhas; Cheetham, A K; Rao, C N R (Elsevier Science BV, 2005-12)

In order to understand the differences between the nature of the electron- and the hole-doped compositions of rare earth manganates, properties of single crystals of Nd1−xCaxMnO3 with x=0.6 and 0.4 have been investigated. ...

Effect Of Substitution Of Mn3+ By Other Trivalent Cations On The Colossal Magnetoresistance And Related Properties Of The Manganates: La(0.7)A(0.3)Mn(1-X)M(X)O(3) (A = Ca, Sr, Pb; M = Al, Cr, Fe, Co)

Sugantha, M; Singh, R S; Guha, A; Raychaudhuri, A K; Rao, C N R (Pergamon Elsevier Science Ltd, 1998-07)

Investigations of the manganates of the general formula La(0.7)A(0.3)Mn(1-x)M(x)O(3) with A = Ca, Sr, or Pb and M = Al, Cr, Fe, or Co in the x range 0.00-0.20 have shown that the ferromagnetic Tc and the insulator-metal ...

Gas Sensing Characteristics Of Superconducting Cuprates

Grantscharova, Emilia; Raju, Addepalli R; Rao, C N R (Chemical Society Of Japan, 1991-10)

Gas sensing characteristics of YBa2Cu3O7-delta, La2-x SrxCuO4, and Bi2Y1-xCaxSr2Cu2O8 have been examined. La2-x SrxCuO4 (x = 0.075), and Bi2YSr2Cu2O8 are found to show good sensitivity (almost-equal-to 10 ppm) to ethyl ...

Electronic transitions of AlCl3, AlBr3, and FeCl3 in the vapor phase: An electron energy loss spectroscopic study

Pradeep, T; Rao, C N R (Academic Press Inc, 1990-02)

Giant Magnetoresistance and Related Properties of Rare-Earth Manganates and Other Oxide Systems

Rao, C N R; Cheetham, A K; Mahesh, R (American Chemical Society, 1996)

Giant magnetoresistance (GMR), which was until recently confined to magnetic layered and granular materials, as well as doped magnetic semiconductors, occurs in manganate perovskites of the general formula Ln(1-x)A(x)MnO(3) ...

Buckminsterfullerene, C60 : Improved synthesis, electron microscopy, electron states, anions and related aspects

Pradeep, T; D'Souza, F; Subbanna, G N; Krishnan, V; Rao, C N R (Indian Academy of Sciences, 1991-10)

Buckminsterfullerene, obtained in good yields at high rates by a suitably designed generator, has been characterized by electron microscopy and in terms of an approximate energy level diagram; C60 undergoes four reversible ...

Coadsorption of Dioxygen and Water on the Ni(110) Surface : Role of O-.Type Species in the Dissociation of Water

Kulkarni, G U; Rao, C N R; Roberts, M W (American Chemical Society, 1995)

While the adsorption of dioxygen at a clean Ni(110) surface gives rise to two O(1s) features at 531 and 530 eV assigned to O-(a) and O2-(a) type species respectively, coadsorption of dioxygen and water mixtures result in ...

Magnetic Structure and Giant Magnetoresistance of Ferromagnetic La1−δMn1−δO3—An Example of Double-Exchange Striction?

Cheetham, A K; Rao, C N R; Vogt, T (Academic Press Inc, 1996-11-01)

A neutron powder diffraction study of the structure of the rhombohedral phase of La1−δMn1−δO3(δ = 0.04) as a function of temperature has been carried out. The crystal structure is well described at all temperatures by a ...

Systematics In The Thermopower Behaviour Of Several Series Of Bismuth And Thallium Cuprate Superconductors : An Interpretation Of The Temperature Variation And The Sign Of The Thermopower

Rao, C N R; Ramakrishnan, T V; Kumar, N (Elsevier Science BV, 1990-01-15)

The thermopower, α, of many members of the Bi2Ca1−xYxSr2Cu2O8+δ, Bi2−yPbyCaSr2Cu2O8 +δ, TlyCa1−xYxBa2Cu2O6+δ, TlCa1−xLnxSr2Cu2O6+δ and TlSr2−xLaxCuO5+δ systems is positive down to Tc, but is negat ive in some of them. The ...

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