Tuning wetting by tailoring surface morphology (2008)
Sarkar, S., Patra, S., Gayathri, N., Banerjee, S.
The relation between the contact angle of a liquid drop and the morphological parameters of the solid surface have been investigated. We show experimentally that the wetting property of a solid...
Fabry's disease: An ultrastructural study of nerve biopsy (2008)
Gayathri, N, Yasha, TC, Kanjalkar, M, Agarwal, S, Santosh, V, Shankar, SK
Lattice Resistance to Dislocation Motion at the Nanoscale (2008)
Dutta, A., Bhattacharya, M., Barat, P., Mukherjee, P., Gayathri, N., Das, G. C.
In this letter we propose a model that demonstrates the effect of free surface on the lattice resistance experienced by a moving dislocation in nanodimensional systems. This effect manifests in an...
Chatterjee, A., Sarkar, A., Barat, P., Mukherjee, P., Gayathri, N.
The Portevin-Le Chatelier(PLC) effect has been investigated by deforming Al-2.5%Mg alloy in the strain rate regime where simultaneously two types (type B and type A) of serrations appear in the...
Markov Property of Continuous Dislocation Band Propagation (2008)
Chatterjee, A., Sarkar, A., Bhattacharya, Sourav, Mukherjee, P., Gayathri, N., Barat, P.
Tensile tests were carried out by deforming polycrystalline samples of substitutional Al-2.5%Mg alloy at room temperature for a range of strain rates. The Portevin-Le Chatelier (PLC) effect was...
Change in the room temperature magnetic property of ZnO upon Mn doping (2007)
Banerjee, S., Rajendran, K., Gayathri, N., Sardar, M., Senthilkumar, S., Sengodan, V.
We present in this paper the changes in the room temperature magnetic property of ZnO on Mn doping prepared using solvo-thermal process. The zero field cooled (ZFC) and field cooled (FC)...
Enhancement of ferromagnetism upon thermal annealing in pure ZnO (2007)
Banerjee, S., Mandal, M., Gayathri, N., Sardar, M.
We report here enhancement of ferromagnetism in pure ZnO upon thermal annealing with the ferromagnetic transition temperature Tc above room temperature. We observe a finite coercive field upto 300K...
Sridharan, V., Banerjee, Sangam, Sardar, Manas, Dhara, Sandip, Gayathri, N., Sastry, V. S.
In this letter we report observation of room temperature ferromagnetism in bulk Ga$_2$O$_3$ . We also observe large (10-60%) increase/decrease in photoluminescence. In the red(700 nm...
Enhanced thermopower upon Ni substitution in Na0.75CoO2 (2005)
Gayathri, N., Bharathi, A., Hariharan, Y.
Thermopower measurements have been carried out on the Ni substituted samples of Na0.75CoO2 in the temperature range 4.2K to 300K. The room temperature TEP increases by 20microV/K even with 1% Ni...
Banerjee, S., Sinha, N. K., Gayathri, N., Ponraju, D., Dash, S., Tyagi, A. K., ...
We report here that atomic force microscope (AFM) in frictional force mode can be used to detect onset of chain scission and crosslinking in polymeric and macromolecular samples upon irradiation. A...
Drastic ground state changes induced by Ni substitution in NaxCoO2 (2005)
Gayathri, N., Premila, M., Bharathi, A., Sastry, V. S., Sundar, C. S., Hariharan, Y.
We report on the effect of Ni substitution at the Co site on the physical properties of NaxCoO2 system by investigating the series NaxCo1-yNiyO2 (x=0.75, 0
Raman Scattering Investigation of Electron Phonon Coupling in Carbon substituted MgB2 (2005)
Sakuntala, T., Bharathi, A., Deb, S. K., Gayathri, N., Sundar, C. S., Hariharan, Y.
Room temperature Raman scattering measurements have been carried out on well characterized samples of MgB2-xCx. The Raman line corresponding to the E2g phonon mode shows progressive hardening from...
Banerjee, S., Sardar, M., Gayathri, N., Tyagi, A. K., Raj, Baldev
We present an extensive study on electrical spectroscopy of graphene ribbons and edges of highly oriented pyrolytic graphite (HOPG) using atomic force microscope (AFM). We have addressed in the...
In this paper we report the results of electrical resistivity $(1.5\leq T \leq 300K)$ and point contact spectroscopy (PCS) measurements on single crystals of metallic sodium tungsten bronze with...
Mapping of surface local elastic constant using Atomic Force Acoustic Microscopy (2004)
Banerjee, S., Gayathri, N., Shannigrahi, S. R., Dash, S., Tyagi, A. K., Raj, B.
We report a systematic study to determine local elastic properties of surfaces combining atomic force microscope (AFM) with acoustic waves which is known as atomic force acoustic microscopy - AFAM....
In this paper we report the results of electrical resistivity $(1.5\leq T \leq 300K)$ and point contact spectroscopy (PCS) measurements on single crystals of metallic sodium tungsten bronze with...
Mitra, J, Raychaudhuri, AK, Gayathri, N, Mukovskii, Ya M
In this paper we report point-contact spectroscopy (PCS) measurements on single crystals of metallic $La_0_._75Sr_0_._2_5MnO_3$. The electron-phonon coupling function as obtained from the PCS shows...
Mitra, J, Raychaudhuri, AK, Gayathri, N, Mukovskii, Ya M
In this paper we report point-contact spectroscopy (PCS) measurements on single crystals of metallic $La_0_._75Sr_0_._2_5MnO_3$. The electron-phonon coupling function as obtained from the PCS shows...
Vasculitic neuropathy in HIV infection : a clinicopathological study. (2001)
Mahadevan, A, Gayathri, N, Taly, A, Santosh, V, Yasha, T, Shankar, S
Gayathri, N, Das, S, Vasanth, A, Devi, M, Ramamohan, Y, Santosh, V, ...
Experimental studies have demonstrated that the vibrational dephasing of overtones do not always follow the quadratic quantum number ~n! dependence predicted by the Kubo Oxtoby theory of vibrational...
Experimental studies have demonstrated that the vibrational dephasing of overtones do not always follow the quadratic quantum number ~n! dependence predicted by the Kubo Oxtoby theory of vibrational...
Gayathri, N., Raychaudhuri, A. K.
In this paper we report the results of electrical resistivity (1.5K < T
Magnetoresistance of metallic perovskite oxide LaNiO$_{3-\delta}$ (1998)
Gayathri, N., Raychaudhuri, A. K., Xu, X. Q., Peng, J. L., Greene, R. L.
We report a study of the magnetoresistance (MR) of the metallic perovskite oxide LaNiO$_{3-\delta}$ as a function of the oxygen stoichiometry $\delta$ ($\delta \leq$ 0.14), magnetic field (H $\leq...
Arulraj, Anthony, Gundakaram, R, Biswas, Amlan, Gayathri, N, Raychaudhuri, AK, Rao, CNR
A detailed investigation of $Y_{0.5}Ca_0.5}MnO_3$ with a very small radius of the A-site cations $(\langle r_A \rangle \approx 1.13 \AA)$ reveals the occurrence of a charge- ordering transition in...
Arulraj, Anthony, Gundakaram, R, Biswas, Amlan, Gayathri, N, Raychaudhuri, AK, Rao, CNR
A detailed investigation of $Y_{0.5}Ca_0.5}MnO_3$ with a very small radius of the A-site cations $(\langle r_A \rangle \approx 1.13 \AA)$ reveals the occurrence of a charge- ordering transition in...
Gayathri, N, Raychaudhuri, AK, Tiwary, SK
In this paper we report the results of an extensive investigation of the $La_{0.7}Ca_{0.3}Mn_{1-x}Co_xO_3$ system. Substitution of Mn by Co dilutes the double-exchange (DE) mechanism and changes the...
Gayathri, N, Raychaudhuri, AK, Tiwary, SK
In this paper we report the results of an extensive investigation of the $La_{0.7}Ca_{0.3}Mn_{1-x}Co_xO_3$ system. Substitution of Mn by Co dilutes the double-exchange (DE) mechanism and changes the...
Gundakaram, R, Arulraj, Anthony, Vanitha, PV, Rao, CNR, Gayathri, N, Raychaudhuri, AK, ...
Magnetic and electrical properties of oxides of the formula $LnMn_{1-x}Cr_xO_3$ (Ln= rare earth) have been investigated to understand the importance of the $Mn^{3+}-O-Cr^{3+}$ superexchange...
Gundakaram, R, Arulraj, Anthony, Vanitha, PV, Rao, CNR, Gayathri, N, Raychaudhuri, AK, ...
Magnetic and electrical properties of oxides of the formula $LnMn_{1-x}Cr_xO_3$ (Ln= rare earth) have been investigated to understand the importance of the $Mn^{3+}-O-Cr^{3+}$ superexchange...