Rao, SS, Padmanabhan, B, Elizabeth, Suja, Bhat, HL, Bhat, SV
In this paper we present the preparation and physical property studies on $Pr_{0.7}Pb_{0.3}MnO_3$(PPMO) nanoparticles with an average grain size of 5 nm. We find from SQUID magnetometry measurements...
Spin probe ESR studies of dynamics of single walled carbon nanotubes (2008)
Dhami, AK, Bhat, Shrivalli, Sharma, Ajay, Bhat, SV
The highly sensitive technique of spin-probe Electron Spin Resonance (ESR) has been used to study dynamics of carbon nanotubes. The ESR signals were recorded for the nitroxide free radical TEMPO in...
Mandal, Sukhendu, Banerjee, Debamalya, Bhat, SV, Pati, Swapan K, Natarajan, Srinivasan
A new open-framework iron phosphite, $[C_4N_2H_{12}][Fe_4(H_2O)_3(HPO_3)_7]·(H_2O)_x x = 0.6 (1)$ , has been prepared by the hydrothermal reaction between $FeCl_3·6H_2O, H_3PO_3$, and piperazine....
Anuradha, KN, Rao, SS, Sharma, A, Bhat, SV
Electron paramagnetic resonance (EPR) and magnetic properties of nanocrystalline $Pr_{0.57}Ca_{0.41}Ba_{0.02}MnO_3$ are studied and compared with those of the bulk material. The nanoscale samples...
The Cr-doped rare-earth manganites $Nd_{0.5}Ca_{0.5}Mn_{1-x} Cr_xO_3$ (x = 0.03, 0.05, 0.10) are studied by electron magnetic resonance (EMR) and magnetization measurements in the paramagnetic as...
Mandal, Sukhendu, Banerjee, Debamalya, Bhat, SV, Pati, Swapan K, Natarajan, Srinivasan
A new open-framework iron phosphite, $[C_4N_2H_{12}][Fe_4(H_2O)_3(HPO_3)_7]·(H_2O)_x x = 0.6 (1)$ , has been prepared by the hydrothermal reaction between $FeCl_3·6H_2O, H_3PO_3$, and piperazine....
Anuradha, KN, Rao, SS, Sharma, A, Bhat, SV
Electron paramagnetic resonance (EPR) and magnetic properties of nanocrystalline $Pr_{0.57}Ca_{0.41}Ba_{0.02}MnO_3$ are studied and compared with those of the bulk material. The nanoscale samples...
The Cr-doped rare-earth manganites $Nd_{0.5}Ca_{0.5}Mn_{1-x} Cr_xO_3$ (x = 0.03, 0.05, 0.10) are studied by electron magnetic resonance (EMR) and magnetization measurements in the paramagnetic as...
Spin probe ESR studies of dynamics of single walled carbon nanotubes (2008)
Dhami, AK, Bhat, Shrivalli, Sharma, Ajay, Bhat, SV
The highly sensitive technique of spin-probe Electron Spin Resonance (ESR) has been used to study dynamics of carbon nanotubes. The ESR signals were recorded for the nitroxide free radical TEMPO in...
Studies on ac losses in $Bi_2Sr_2CaCu_2O_8$ single crystals (2007)
Chockalingam, SP, Sarangi, S, Bhat, SV, Oka, K, Nishihara, Y
Using a novel technique of measuring absolute ac losses at radio frequencies, the temperature, magnetic field and angle dependence of rf losses in superconducting single crystals of...
Anuradha, KN, Rao, SS, Bhat, SV
Nanowires of $Pr_{0.57}Ca_{0.41}Ba_{0.02}MnO_3$ (PCBM) (diameter similar to 80-90 nm and length similar to 3.5 mu m) were synthesized by a low reaction temperature hydrothermal method. Single-phase...
Nanoparticles (dia. similar to 5-7 nm) of $Bi_{0.5}X_{0.5}(X = Ca, Sr)MnO_3$ are prepared by polymer assisted sol-gel method and characterized by various physico-chemical techniques. X-ray...
A Study of $Mn^{2+}$ Doping in CdS Nanocrystals (2007)
Nag, Angshuman, Sapra, Sameer, Nagamani, C, Sharma, Ajay, Pradhan, N, Bhat, SV, ...
We report here the synthesis of water soluble $Mn^{2+}$-doped CdS nanocrystals in which it has been possible for the first time to obtain a distinct $Mn^{2+}$ d-related emission well-separated from...
Surface-Enhanced Raman Spectra of Aza-aromatics on Nanocrystals of Metallic $ReO_3$ (2007)
Biswas, Kanishka, Bhat, SV, Rao, CNR
Surface-enhanced Raman spectra (SERS) of pyridine have been investigated on the surfaces of the metallic $ReO_3$ nanocrystals with diameters in the range of 12-32.5 nm. On $ReO_3$ nanocrystal...
Surface-Enhanced Raman Spectra of Aza-aromatics on Nanocrystals of Metallic $ReO_3$ (2007)
Biswas, Kanishka, Bhat, SV, Rao, CNR
Surface-enhanced Raman spectra (SERS) of pyridine have been investigated on the surfaces of the metallic $ReO_3$ nanocrystals with diameters in the range of 12-32.5 nm. On $ReO_3$ nanocrystal...
Anuradha, KN, Rao, SS, Bhat, SV
Nanowires of $Pr_{0.57}Ca_{0.41}Ba_{0.02}MnO_3$ (PCBM) (diameter similar to 80-90 nm and length similar to 3.5 mu m) were synthesized by a low reaction temperature hydrothermal method. Single-phase...
Nanoparticles (dia. similar to 5-7 nm) of $Bi_{0.5}X_{0.5}(X = Ca, Sr)MnO_3$ are prepared by polymer assisted sol-gel method and characterized by various physico-chemical techniques. X-ray...
A Study of $Mn^{2+}$ Doping in CdS Nanocrystals (2007)
Nag, Angshuman, Sapra, Sameer, Nagamani, C, Sharma, Ajay, Pradhan, N, Bhat, SV, ...
We report here the synthesis of water soluble $Mn^{2+}$-doped CdS nanocrystals in which it has been possible for the first time to obtain a distinct $Mn^{2+}$ d-related emission well-separated from...
Studies on ac losses in $Bi_2Sr_2CaCu_2O_8$ single crystals (2007)
Chockalingam, SP, Sarangi, S, Bhat, SV, Oka, K, Nishihara, Y
Using a novel technique of measuring absolute ac losses at radio frequencies, the temperature, magnetic field and angle dependence of rf losses in superconducting single crystals of...
Rao, SS, Tripathi, S, Pandey, D, Bhat, SV
$Nd_{0.5}Ca_{0.5}MnO_3$ nanoparticles (average diameter ~20 and 40 nm) are synthesized by the polymeric precursor sol-gel method and characterized by various physico-chemical techniques. Quite...
Rao, SS, Tripathi, S, Pandey, D, Bhat, SV
$Nd_{0.5}Ca_{0.5}MnO_3$ nanoparticles (average diameter ~20 and 40 nm) are synthesized by the polymeric precursor sol-gel method and characterized by various physico-chemical techniques. Quite...
Rao, SS, Anuradha, KN, Sarangi, S, Bhat, SV
We have prepared crystalline nanowires (diameter similar to 50 nm,length similar to a few microns) of the charge-ordering manganite $Pr_{0.5}Ca_{0.5}MnO_{3}$ using a low reaction temperature...
Sarangi, S, Chockalingam, SP, Bhat, SV
The origins of ac losses in the high $T_{c}$ superconductors are not addressed adequately in the literature. We found out that frequent Josephson junction (JJ) decoupling (both intergranular and...
Sitaram, V, Sharma, Ajay, Bhat, SV, Mizoguchi, K, Menon, Reghu
X-band electron spin resonance (ESR) of polyaniline (PANI) doped with 2-acrylamido-2-methyl-1-propane sulfonic acid (AMPSA), at conductivity values of 90, 4, and 0.2 S/cm, has been investigated from...
The design, fabication, and performance of an apparatus for measurement of nonresonant rf power absorption (NRRA) in superconducting and CMR samples are described. The system consists of an effective...
The design, fabication, and performance of an apparatus for measurement of nonresonant rf power absorption (NRRA) in superconducting and CMR samples are described. The system consists of an effective...
Sitaram, V, Sharma, Ajay, Bhat, SV, Mizoguchi, K, Menon, Reghu
X-band electron spin resonance (ESR) of polyaniline (PANI) doped with 2-acrylamido-2-methyl-1-propane sulfonic acid (AMPSA), at conductivity values of 90, 4, and 0.2 S/cm, has been investigated from...
Rao, SS, Anuradha, KN, Sarangi, S, Bhat, SV
We have prepared crystalline nanowires (diameter similar to 50 nm,length similar to a few microns) of the charge-ordering manganite $Pr_{0.5}Ca_{0.5}MnO_{3}$ using a low reaction temperature...
Sarangi, S, Chockalingam, SP, Bhat, SV
The origins of ac losses in the high $T_{c}$ superconductors are not addressed adequately in the literature. We found out that frequent Josephson junction (JJ) decoupling (both intergranular and...
Sharma, Ajay, Sarangi, Subhasis, Bhat, SV
The 'two-electron' doped rare earth manganites $Ca_1_-_xCe_xMnO_3$ (x = 0.1, 0.2) are probed using resistivity, ac susceptibility and electron paramagnetic resonance (EPR) measurements across their...
Electron magnetic resonance studies of nanomanganite $Nd_0_._6_7Sr_0_._3_3MnO_3$ (2005)
Rao, SS, Sarangi, Subhasis, Venkataiah, G, Reddy, Venu Gopala, Bhat, SV
$Nd_0_._6_7Sr_0_._3_3MnO_3$ (NSMO) nano particles with the grain size of about 30 nm are prepared by sol-gel method. These nanopowders are annealed at four different temperatures viz 800 $^\circ C$,...
Sarangi, S, Chockalingam, SP, Mavinkurve, Raghav G, Bhat, SV, Kumar, N
Our experiments show that for two or more pieces of different lengths of a wire combined in parallel and connected to a dc source, the current ratio evolves towards unity as the combination is cooled...
Chockalingam, SP, Sarangi, S, Bhat, SV, Oka, K, Nishihara, Y
We have studied rf power dissipation in $Bi_{2}Sr_{2}CaCu_{2}O_{8}$ single crystals as a function of angle \Theta between the applied field and c-axis of the crystal by using a novel technique of...
Sharma, Ajay, Sarangi, Subhasis, Bhat, SV
The 'two-electron' doped rare earth manganites $Ca_1_-_xCe_xMnO_3$ (x = 0.1, 0.2) are probed using resistivity, ac susceptibility and electron paramagnetic resonance (EPR) measurements across their...
Electron magnetic resonance studies of nanomanganite $Nd_0_._6_7Sr_0_._3_3MnO_3$ (2005)
Rao, SS, Sarangi, Subhasis, Venkataiah, G, Reddy, Venu Gopala, Bhat, SV
$Nd_0_._6_7Sr_0_._3_3MnO_3$ (NSMO) nano particles with the grain size of about 30 nm are prepared by sol-gel method. These nanopowders are annealed at four different temperatures viz 800 $^\circ C$,...
Sarangi, S, Chockalingam, SP, Mavinkurve, Raghav G, Bhat, SV, Kumar, N
Our experiments show that for two or more pieces of different lengths of a wire combined in parallel and connected to a dc source, the current ratio evolves towards unity as the combination is cooled...
Chockalingam, SP, Sarangi, S, Bhat, SV, Oka, K, Nishihara, Y
We have studied rf power dissipation in $Bi_{2}Sr_{2}CaCu_{2}O_{8}$ single crystals as a function of angle \Theta between the applied field and c-axis of the crystal by using a novel technique of...
An electron paramagnetic resonance study of phase segregation in $Nd_{0.5}Sr_{0.5}MnO_3$ (2004)
Joshi, Janhavi P, Sood, AK, Bhat, SV, Parashar, Sachin, Raju, AR, Rao, CNR
We present results of an electron paramagnetic resonance (EPR) study of $Nd_{1-x}Sr_xMnO_3$ with x = 0.5 across the paramagnetic to ferromagnetic, insulator to metal transition at 260K $(T_c)$ and...
Joshi, Janhavi P, Bhagwat, Amar R, Sarangi, Subhasis, Sharma, Ajay, Bhat, SV
In this paper we present transport, magnetic and electron paramagnetic resonance (EPR) studies of electron doped manganites $Nd_xCa_{1-x}MnO_3(x = 0.2, 0.3)$ with a view to compare and contrast their...
On the analysis of broad Dysonian electron paramagnetic resonance spectra (2004)
We analyze the equation used for simulating the lineshapes of broad electron paramagnetic resonance spectra in conducting samples (i.e., broad Dysonian lineshapes) where it becomes necessary to...
Joshi, Janhavi P, Sarathy, Vijaya K, Sood, AK, Bhat, SV, Rao, CNR
We present and compare the results of temperature-dependent electron paramagnetic resonance (EPR) studies on $Pr_{1-x}Ca_xMnO_3$ for x = 0.64, which is electron-doped, with results of studies on the...
The effect of $\delta-Al_2O_3$ nanoparticles (size ~ 10 nm) on the ionic conductivity and related properties of a solid polymer electrolyte (SPE) that consists of low molecular weight (Mw = 2000)...
Singh, Joykumar, Ganeshsanjeev, *, Siddappa, K, Bhat, SV
The effect of electron-beam (4-8 MeV) irradiation on the ionic conductivity of a solid polymer electrolyte, poly(ethylene glycol) complexed with $LiClO_4$ , was studied. A large enhancement of the...
Vitrification and glass transition of water:insights from spin probe ESR (2004)
Bhat, Shrivalli N, Sharma, Ajay, Bhat, SV
Three long standing problems related to the physics of water viz, the possibility of vitrifying bulk water by rapid quenching, its glass transition, and the supposed impossibility of obtaining...
An electron paramagnetic resonance study of phase segregation in $Nd_{0.5}Sr_{0.5}MnO_3$ (2004)
Joshi, Janhavi P, Sood, AK, Bhat, SV, Parashar, Sachin, Raju, AR, Rao, CNR
We present results of an electron paramagnetic resonance (EPR) study of $Nd_{1-x}Sr_xMnO_3$ with x = 0.5 across the paramagnetic to ferromagnetic, insulator to metal transition at 260K $(T_c)$ and...
Joshi, Janhavi P, Bhagwat, Amar R, Sarangi, Subhasis, Sharma, Ajay, Bhat, SV
In this paper we present transport, magnetic and electron paramagnetic resonance (EPR) studies of electron doped manganites $Nd_xCa_{1-x}MnO_3(x = 0.2, 0.3)$ with a view to compare and contrast their...
Joshi, Janhavi P, Sarathy, Vijaya K, Sood, AK, Bhat, SV, Rao, CNR
We present and compare the results of temperature-dependent electron paramagnetic resonance (EPR) studies on $Pr_{1-x}Ca_xMnO_3$ for x = 0.64, which is electron-doped, with results of studies on the...
On the analysis of broad Dysonian electron paramagnetic resonance spectra (2004)
We analyze the equation used for simulating the lineshapes of broad electron paramagnetic resonance spectra in conducting samples (i.e., broad Dysonian lineshapes) where it becomes necessary to...
The effect of $\delta-Al_2O_3$ nanoparticles (size ~ 10 nm) on the ionic conductivity and related properties of a solid polymer electrolyte (SPE) that consists of low molecular weight (Mw = 2000)...
Singh, Joykumar, Ganeshsanjeev, *, Siddappa, K, Bhat, SV
The effect of electron-beam (4-8 MeV) irradiation on the ionic conductivity of a solid polymer electrolyte, poly(ethylene glycol) complexed with $LiClO_4$ , was studied. A large enhancement of the...
Vitrification and glass transition of water:insights from spin probe ESR (2004)
Bhat, Shrivalli N, Sharma, Ajay, Bhat, SV
Three long standing problems related to the physics of water viz, the possibility of vitrifying bulk water by rapid quenching, its glass transition, and the supposed impossibility of obtaining...
Morphology and conductivity studies of a new solid polymer electrolyte: (PEG)xLiCIO4 (2003)
A new solid polymer electrolyte, (PEG)xLiClO4, consisting of poly(ethylene)glycol of molecular weight 2000 and LiClO4 was prepared and characterized using XRD, IR, SEM, DSC, NMR and impedance...
Optical and Magnetic Properties of Manganese-Doped Zinc Sulfide Nanoclusters (2003)
Sapra, Sameer, Nanda, J, Anand, A, Bhat, SV, Sarma, DD
We report the synthesis of fixed-size ZnS nanoclusters ~24 Å in diameter with varying manganese concentrations. Various samples of $Zn_{1-x} Mn_x S$, with x = 0, 0.02, 0.055, 0.09, and 0.13, have...
Magnetic study of an amorphous conducting polyaniline (2003)
Chaudhuri, Debangshu, Kumar, Ashwani, Sarma, DD, Hernández, Garcia M, Joshi, Janhavi P, Bhat, SV
We show that newly found BF3-doped polyaniline, although highly conducting, remains amorphous. Magnetic studies reveal many unusual properties, while suggesting that the intrinsic conductivity of...
Magnetic study of an amorphous conducting polyaniline (2003)
Chaudhuri, Debangshu, Kumar, Ashwani, Sarma, DD, Hernández, Garcia M, Joshi, Janhavi P, Bhat, SV
We show that newly found BF3-doped polyaniline, although highly conducting, remains amorphous. Magnetic studies reveal many unusual properties, while suggesting that the intrinsic conductivity of...
Morphology and conductivity studies of a new solid polymer electrolyte: (PEG)xLiCIO4 (2003)
A new solid polymer electrolyte, (PEG)xLiClO4, consisting of poly(ethylene)glycol of molecular weight 2000 and LiClO4 was prepared and characterized using XRD, IR, SEM, DSC, NMR and impedance...
Optical and Magnetic Properties of Manganese-Doped Zinc Sulfide Nanoclusters (2003)
Sapra, Sameer, Nanda, J, Anand, A, Bhat, SV, Sarma, DD
We report the synthesis of fixed-size ZnS nanoclusters ~24 Å in diameter with varying manganese concentrations. Various samples of $Zn_{1-x} Mn_x S$, with x = 0, 0.02, 0.055, 0.09, and 0.13, have...
Color center formation in sapphire by swift heavy ion irradiation (2003)
Mohanty, T, Mishra, NC, Singh, F, Bhat, SV, Kanjilal, D
Single crystals of sapphire$ (\propto-Al_{2}O_{3}) $were irradiated at room temperature with 100 and 190 MeV silver (Ag) ions from theb 15 UD Pelletron at the Nuclear Science Centre, New Delhi. The...
Kumar, Anika, Ghosh, Nilotpal, Joshi, Janhavi P, Bhat, HL, Bhat, SV
Single crystals of $Nd_{1-x}Pb_xMnO_3$ with x=0.2 are grown by high temperature solution growth technique using $PbO–PbF_2$ flux. Magnetization studies on the samples show a transition to a...
Non-resonant microwave absorption studies of superconducting $MgB_2$ and $MgB_2+ MgO$ (2002)
Joshi, Janhavi P, Sarangi, Subhasis, Sood, AK, Pal, Dilip, Bhat, SV
Non-resonant microwave absorption (NRMA) studies of superconducting $MgB_2$ and a sample containing $\sim10$% by weight of MgO in $MgB_2$ are reported. The NRMA results indicate near absence of...
Joshi, Janhavi P, Gupta, Rajeev, Sood, AK, Bhat, SV, Raju, AR, Rao, CNR
We report electron paramagnetic resonance measurements on single crystalline and powder samples of Nd0.5Ca0.5MnO3 across the charge-ordering transition at Tco = 240 K down to the antiferromagnetic...
Non-resonant microwave absorption studies of superconducting $MgB_2$ and $MgB_2+ MgO$ (2002)
Joshi, Janhavi P, Sarangi, Subhasis, Sood, AK, Pal, Dilip, Bhat, SV
Non-resonant microwave absorption (NRMA) studies of superconducting $MgB_2$ and a sample containing $\sim10$% by weight of MgO in $MgB_2$ are reported. The NRMA results indicate near absence of...
Kumar, Anika, Ghosh, Nilotpal, Joshi, Janhavi P, Bhat, HL, Bhat, SV
Single crystals of $Nd_{1-x}Pb_xMnO_3$ with x=0.2 are grown by high temperature solution growth technique using $PbO–PbF_2$ flux. Magnetization studies on the samples show a transition to a...
Joshi, Janhavi P, Gupta, Rajeev, Sood, AK, Bhat, SV, Raju, AR, Rao, CNR
We report electron paramagnetic resonance measurements on single crystalline and powder samples of Nd0.5Ca0.5MnO3 across the charge-ordering transition at Tco = 240 K down to the antiferromagnetic...
Joshi, Janhavi P, Anand, A, Bhat, SV, Chowdhury, P, Bhatia, SN
We report the results of our non-resonant microwave absorption (NRMA) studies on single crystals of $Tl_2Ba_2CaCu_2O_8$ (Tl 2212) which reflect the occurrence of intrinsic Josephson coupling in these...
Electron spin resonance (ESR) studies of ClO3 and ClO2 radicals in X-irradiated potassium perchlorate, KClO4, single crystals are carried out to investigate the radiation decomposition pathways. The...
Joshi, Janhavi P, Anand, A, Bhat, SV, Chowdhury, P, Bhatia, SN
We report the results of our non-resonant microwave absorption (NRMA) studies on single crystals of $Tl_2Ba_2CaCu_2O_8$ (Tl 2212) which reflect the occurrence of intrinsic Josephson coupling in these...
Electron spin resonance (ESR) studies of ClO3 and ClO2 radicals in X-irradiated potassium perchlorate, KClO4, single crystals are carried out to investigate the radiation decomposition pathways. The...
We report on the effect of addition of low molecular weight $(M_w =400)$ PEG on protonic conduction of the solid polymer electrolyte $(PEG)_{100} NH_4 ClO_4$. We study the changes in the temperature...
We report on the effect of addition of low molecular weight $(M_w =400)$ PEG on protonic conduction of the solid polymer electrolyte $(PEG)_{100} NH_4 ClO_4$. We study the changes in the temperature...
Sudershan, YS, Rastogi, Amit, Bhat, SV, Grover, AK, Yamaguchi, Y, Oka, K, ...
The magnetic field dependent r.f. (20 MHz) power dissipation, P(H) vs H, for $H_{r.f.}$ \parallel c \parallel H in $Bi_2Sr_2CaCu_20_8$ (Bi 2 2 1 2) single crystals shows an onset at T \sim 102 K,...