Thermoelectric Properties of Fe0.2Co3.8Sb12-xTex ... - Physics
Thermoelectric Properties of Fe0.2Co3.8Sb12-xTex ... - Physics Thermoelectric Properties of Fe0.2Co3.8Sb12-xTex ... - Physics
Magnetic, Dielectric and Transport Studies of Single Crystal Tb 0.5 Sr 0.5 MnO 3 Hariharan N, Aneesh C, H L Bhat and Suja Elizabeth Department of Physics, Indian Institute of Science, Bangalore, 560012 ABSTRACT Half doped Tb 0.5 Sr 0.5 MnO 3 single crystal is grown by four mirror Optical Float-Zone Furnace. Temperature dependence of dc magnetic susceptibility is carried out in sample with arbitrary orientation at different fields and a magnetic anomaly is observed around 42 K. Isothermal magnetization measurements carried at 5 K shows a magnetic hysteresis which is not seen at 50 K, just above the magnetic anomaly temperature. Dielectric properties are measured in the temperature range 15K-300K with different frequencies ranging from 400Hz to 4MHz .Both real and imaginary parts of the dielectric constant show clear frequency dispersion which suggests that these materials could be relaxor ferroelectric. Transport properties of the sample are measured in four probe geometry between 60- 300K. While cooling in this temperature range resistance of the sample steadily increases and was five orders in magnitude higher at 60 K. References 1. Appl.Phys.Lett. 96, 152103, (2008). 2. J.Appl.Phys. 83, 7664, (1998).
Direct Numerical Simulation of Turbulence in the Two-Dimensional Navier-Stokes-Cahn-Hilliard Equations Nairita Pal, Anupam Gupta and Rahul Pandit Department of Physics, Indian Institute of Science, Bangalore November 15, 2012 Abstract We study a phase-field model for a mixture of two-dimensional(2D) incompressible fluids, both of which obey the Navier-Stokes Equation.We elucidate their mixing by introducing a phase-field order parameter which obeys the Cahn-Hilliard Equation. We have developed an MPI, parallel, pseudospectral code for the direct numerical simulation (DNS) of the coupled Navier-Stokes-Cahn-Hilliard Equations in 2D. We present preliminary results from this DNS for decaying turbulence in this system. We concentrate on statistical properties such as the energy and dissipation time-series, the enrgy and enstrophy spectra, dissipation-reduction-type phenomena and the motion of droplets of the minority phase in this turbulent binary-fluid mixture. 1
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Magnetic, Dielectric and Transport Studies <strong>of</strong> Single Crystal Tb 0.5 Sr 0.5 MnO 3<br />
Hariharan N, Aneesh C, H L Bhat and Suja Elizabeth<br />
Department <strong>of</strong> <strong>Physics</strong>, Indian Institute <strong>of</strong> Science, Bangalore, 560012<br />
ABSTRACT<br />
Half doped Tb 0.5 Sr 0.5 MnO 3 single crystal is grown by four mirror Optical Float-Zone Furnace.<br />
Temperature dependence <strong>of</strong> dc magnetic susceptibility is carried out in sample with arbitrary<br />
orientation at different fields and a magnetic anomaly is observed around 42 K. Isothermal<br />
magnetization measurements carried at 5 K shows a magnetic hysteresis which is not seen at 50 K, just<br />
above the magnetic anomaly temperature. Dielectric properties are measured in the temperature range<br />
15K-300K with different frequencies ranging from 400Hz to 4MHz .Both real and imaginary parts <strong>of</strong> the<br />
dielectric constant show clear frequency dispersion which suggests that these materials could be relaxor<br />
ferroelectric. Transport properties <strong>of</strong> the sample are measured in four probe geometry between 60-<br />
300K. While cooling in this temperature range resistance <strong>of</strong> the sample steadily increases and was five<br />
orders in magnitude higher at 60 K.<br />
References<br />
1. Appl.Phys.Lett. 96, 152103, (2008).<br />
2. J.Appl.Phys. 83, 7664, (1998).
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