Author
G.C. Jain
Bio: G.C. Jain is an academic researcher from National Physical Laboratory. The author has contributed to research in topics: Boltzmann equation & Electrical resistivity and conductivity. The author has an hindex of 3, co-authored 3 publications receiving 70 citations.
Papers
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TL;DR: In this article, an analysis of transport properties has been carried out using a general energy dependence of the relaxation time, τ =aEb, and it has been shown by the analysis that if b=− 1 2 there should be a size effect in the electrical conductivity, but the Seebeck coefficient is independent of size.
38 citations
TL;DR: Theoretical calculations of longitudinal (γ L ) and transverse (γ T ) strain coefficients of resistance in continuous films deposited onto mica substrates, are reported in this paper.
19 citations
TL;DR: Using the Boltzmann transport equation, expressions for the magnetoresistance and Hall coefficient in thin metallic films have been derived in this article for low magnetic flux density (∼10 4 gauss) and is a special case of more general work by Sondheimer.
14 citations
Cited by
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TL;DR: In this paper, the effect of the adsorption on the resistance of thin film electrodes, including adsorptions processes of ions, organic compounds, oxygen, hydrogen and underpotential deposition, is discussed.
63 citations
TL;DR: In this paper, the dependence of the resistivity and the Hall effect of copper films on the method of film preparation and the film thickness has been studied before and after adsorption of carbon monoxide.
47 citations
TL;DR: In this article, a shape-engineered monometallic thermocouple was constructed from a lithographically defined nanowire having one abrupt variation in width along its length and tested at room temperature; these structures exploited a change in Seebeck coefficient that is present at these size scales.
Abstract: We study the generation of thermoelectricity by nanoscale thermocouples (TCs) formed from a single layer of metal with cross-sectional discontinuity. Typically, a TC is formed when a second conductor is inserted between two sections of a first conductor forming two junctions situated at different temperatures. Here, we investigate the behavior of TCs formed not of two conductors but rather nanowires of the same metal of two cross-sectional areas. Monometallic TCs were constructed from a lithographically defined nanowire having one abrupt variation in width along its length, and tested at room temperature; these structures exploit a change in Seebeck coefficient that is present at these size scales. To investigate the thermoelectric properties of such “shape-engineered” TCs, nanoscale heaters were employed to set the local temperatures. Temperature profiles at the hot and cold junctions of the TCs were determined both by simulations and experiments. Results demonstrate that the magnitude of the open-circuit voltage, and hence the relative Seebeck coefficient, is a function of the parameters of the variations in the segment widths. The fabrication complexity of such shape-engineered monometallic nanowire TCs is greatly reduced compared to that of conventional bimetallic TCs, and could be mass-produced using simpler manufacturing techniques.
46 citations
TL;DR: In this paper, the performance of a pressure transducer with Au-Ni (89:11) film as strain gauges has been studied, and the effects of postdeposition heat treatment on the resistance of the thin-film strain gauge and hence the output performance of the pressure transducers are discussed.
Abstract: The behavior of a pressure transducer with Au-Ni (89:11) film as strain gauges has been studied. The effects of postdeposition heat treatment on the resistance of the thin-film strain gauges and hence the output performance of the pressure transducer are discussed. The effect of a repeated number of pressure cycles carried out over a period of eight months has also been reported. The maximum nonlinearity and the hysteresis is improved from 0.92% FSO to 0.06% FSO after 1000 pressure cycles. The output behavior of the pressure transducer with temperature has also been studied. >
42 citations
TL;DR: In this article, general theoretical expressions of the thermoelectric power of metallic films were deduced from the Mayadas-Shatzkes conduction model of monocrystalline and polycrystalline films.
38 citations