NOPR Collection:http://nopr.niscpr.res.in/handle/123456789/125862026-10-12T21:24:15Z2026-10-12T21:24:15ZTemperature dependence of antiferroeletric mode frequency, dielectric constant and loss tangent in deuterated squaric acid crystalUpadhyay, Trilok Chandrahttp://nopr.niscpr.res.in/handle/123456789/125952016-07-20T05:09:29Z2011-09-01T00:00:00ZTitle: Temperature dependence of antiferroeletric mode frequency, dielectric constant and loss tangent in deuterated squaric acid crystal
Authors: Upadhyay, Trilok Chandra
Abstract: By fitting model
values of physical quantities for deuterated SQA crystal in theoretically
derived expression for AFE mode frequency, dielectric entrant and loss tangent
in my earlier paper [<i>Indian J Pure & Appl Phys, </i>47 (2009) 119]
temperature dependence of these quantities have been calculated and compared
with experimental data of Maier <i>et al., </i><i style="">Phys Status Solidi (b), </i>89 (1978) 578 and Semmingsen, D<i style="">, Acta Chem Scand</i>, 27 (1977) 3961, which
show a good agreement.
Page(s): 633-6362011-09-01T00:00:00ZSpecific heat jump and transition temperature <i>T</i><sub>C </sub>for La<sub>2</sub><sub>-x</sub>Ba<sub>x</sub>CuO<sub>4</sub>, Bi<sub>2</sub>Ca<sub>n</sub><sub>-1</sub>Sr<sub>n</sub>Cu<sub>n</sub>O<sub>2n+3 </sub>and Tl<sub>2</sub>Ca<sub>n</sub><sub>-1</sub>Ba<sub>2</sub>Cu<sub>n</sub>O<sub>2n+3(2n+4)</sub> superconductorsNyawere, P W OtienoKhanna, KMhttp://nopr.niscpr.res.in/handle/123456789/125942016-07-20T05:08:33Z2011-09-01T00:00:00ZTitle: Specific heat jump and transition temperature <i>T</i><sub>C </sub>for La<sub>2</sub><sub>-x</sub>Ba<sub>x</sub>CuO<sub>4</sub>, Bi<sub>2</sub>Ca<sub>n</sub><sub>-1</sub>Sr<sub>n</sub>Cu<sub>n</sub>O<sub>2n+3 </sub>and Tl<sub>2</sub>Ca<sub>n</sub><sub>-1</sub>Ba<sub>2</sub>Cu<sub>n</sub>O<sub>2n+3(2n+4)</sub> superconductors
Authors: Nyawere, P W Otieno; Khanna, KM
Abstract: The transition
temperature <i style="">T</i><sub>C</sub> and the
specific heat jump ∆<i style="">C</i>/<i style="">T<sub>C</sub></i> in La<sub>2</sub><sub>-x</sub>Ba<sub>x</sub>CuO<sub>4, </sub>Bi<sub>2</sub>Ca<sub>n</sub><sub>-1</sub>Sr<sub>n</sub>Cu<sub>n</sub>O<sub>2n+4</sub>
and Tl<sub>2</sub>Ca<sub>n</sub><sub>-1</sub>Ba<sub>2</sub>Cu<sub>n</sub>O<sub>2n+3(2n+4)</sub> are calculated
using exotic pairing model. These values are calculated at both buckling mode
and breathing mode. The values calculated are compared with known experimental
values. If ∆ is the gap in the allowed energy states, then the jump in the
specific heat is C<sub>S</sub>-C<sub>n</sub>.
These results show that the calculated values of the ratios and <i style="">T</i><sub>C</sub> compare well with
experimental values.
Page(s): 627-6322011-09-01T00:00:00ZStudy of electronic and optical properties of Sc-, Y-, Ti-doped transparent conducting oxideSharma, YaminiSrivastava, Pankajhttp://nopr.niscpr.res.in/handle/123456789/125932016-07-20T05:14:08Z2011-09-01T00:00:00ZTitle: Study of electronic and optical properties of Sc-, Y-, Ti-doped transparent conducting oxide
Authors: Sharma, Yamini; Srivastava, Pankaj
Abstract: Transparent
conducting oxides have important applications as optoelectronic devices. First
principles calculations have been performed to study the electronic and optical
properties of Sc-, Y- and Ti-doped transparent conducting oxide (TCO) material CdO. The dielectric functions,
absorption coefficients and transmittance spectra have been computed to study
the effect of doping. The density of states have also been investigated to
interpret the calculated optical spectra in terms of inter band transitions.
The valence electron charge density is plotted to understand the redistribution
of charges on introduction of transition metal ions. The electrical conductivity
and Hall coefficient have also been calculated. The calculated band gap for
pure CdO which is 0.51 eV increases significantly with doping. The band gaps
for Sc-, Y- and Ti- doped CdO are 2.67, 2.83 and 2.53 eV, respectively, which are
in good agreement with experimental measurements.
Page(s): 619-6262011-09-01T00:00:00ZCharacterization of cold atomic cloud in a magneto-optical trapArora, PoonamChowdhury, SwatilekhaAgarwal, AshishPant, KavindraGupta, Amitava Senhttp://nopr.niscpr.res.in/handle/123456789/125922016-07-20T05:09:28Z2011-09-01T00:00:00ZTitle: Characterization of cold atomic cloud in a magneto-optical trap
Authors: Arora, Poonam; Chowdhury, Swatilekha; Agarwal, Ashish; Pant, Kavindra; Gupta, Amitava Sen
Abstract: The results of
characterization of cold cloud of cesium (Cs) atoms trapped in a
magneto-optical trap (MOT) have been presented. The MOT is a part of the
Physics package of the Cs Fountain Clock being developed at National Physical
Laboratory (NPL), India.
The number of atoms, size and temperature of the cloud have been measured and
calculated. It is also been investigated how the number of trapped atoms
changes with the trapping laser’s beam intensity, detuning and magnetic-field
gradient of the trap.
Page(s): 590-5952011-09-01T00:00:00Z