S V Subramanyam
Articles written in Pramana – Journal of Physics
Volume 3 Issue 5 November 1974 pp 286-294 Liquids
The cylindrical approximation originally proposed by Pippard for the λ-transitions in one-component systems is extended to multicomponent systems. The application of the generalised Pippard relations to binary liquid mixtures is considered. The relations for He3 + He4 mixtures are shown to be equivalent to those obtained by earlier workers. The validity of the relation relating specific heat and thermal expansion for binary liquid systems is discussed on the basis of the measurements performed on the system methaonl +
Volume 7 Issue 4 October 1976 pp 266-276 Statistical Physics
Electrical resistance measurements are reported on the binary liquid mixtures CS2 + CH3CN and CS2 + CH3NO2 with special reference to the critical region. Impurity conduction seems to be the dominant mechanism for charge transport. For the liquid mixture filled at the critical composition, the resistance of the system above
Volume 16 Issue 2 February 1981 pp 151-154 Solid State Physics
Electrical resistivity studies of the charge transfer complex benzidine—TCNQ and its inclusion compound, have been carried out up to pressures 8 GPa. Two types of behaviour were observed in these complexes under high pressure and this difference is interpreted and discussed.
Volume 17 Issue 1 July 1981 pp 25-32 Solid State Physics
The elastic constants of single crystal galena have been determined from the measured ultrasonic velocities down to liquid helium temperature. A cryostat incorporating an arrangement to inject the liquid bonding material at low temperature is described. At 5 K, the values of elastic constants are C11=14.90, C12=3.51 and C44=2.92×1010 N/m2.
Volume 26 Issue 1 January 1986 pp 61-66 Solid State Physics
The current voltage characteristics of
Volume 27 Issue 5 November 1986 pp 647-660 Instrumentation Techniques
The construction of a three-terminal capacitance cell and a bath type cryostat to measure thermal expansion of solids in the temperature range 77 K to 350 K is described. Calculation of the thermal expansion coefficients by using spline approximation is discussed along with the various errors involved in the measurement. The capacitance cell is calibrated by using aluminium and germanium as standard reference materials. The cell has an accuracy of 4% in the measurement of thermal expansion coefficient and a resolution of 1 Å change in length of sample of length 1 cm.
Volume 37 Issue 2 August 1991 pp 147-151
Electrical switching has been observed in
Volume 55 Issue 3 September 2000 pp 455-469 Research Articles
Annealing dependence of the lattice parameter, resistivity, magnetoresistance and thermopower have been studied on Nd0.7-Sr0.33MnO3 thin films deposited on LaAlO3 and alumina substrates by pulsed laser ablation. Upon annealing at 800°C and 1000°C the lattice constant of the LaAlO3 film tends toward that of the bulk target due to reduction in oxygen vacancies. This results in a metal-insulator transition at temperatures which increase with progressive annealing along with a decrease in the observed low temperature MR. Using a magnon scattering model we estimate the
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