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pro vyhledávání: '"M. Gaitonde"'
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Autor:
Ashok K. Verma, D. M. Gaitonde, Rekha Rao, V. Vijayakumar, Alka B. Garg, B. K. Godwal, P. Modak
Publikováno v:
Solid State Communications. 135:285-289
Results of electrical resistance measurements on MgB 2 at ambient temperature up to 25 GPa are presented. An abrupt reduction of nearly 30% in resistance around 18 GPa is observed. Band structure calculations in the presence of a frozen-in distortion
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d522a488b18a02047366ac8d9c12b225
https://doi.org/10.1016/j.ssc.2005.05.011
https://doi.org/10.1016/j.ssc.2005.05.011
Publikováno v:
Solid State Communications. 134:329-332
La3Ni2B2N3, which is similar to YNi2B2C and related borocarbides, was earlier studied by the electronic structure calculations [D.J. Singh, W.E. Pickett, Phys. Rev. B 51 (1995) 8668.], and was predicted to be a 3-D metal. In search of new compounds o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d801affb47045b87b122ed47da1ff18d
https://doi.org/10.1016/j.ssc.2005.01.043
https://doi.org/10.1016/j.ssc.2005.01.043
Publikováno v:
High Pressure Research. 24:525-530
We review various anomalies seen in Raman spectroscopy, superconducting transition temperature T c and electrical resistance at room temperature and high pressure in the new high temperature superconductor MgB2. In order to explore the possibility of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4ff8e26486c135f072997cc896a52c24
https://doi.org/10.1080/08957950412331332078
https://doi.org/10.1080/08957950412331332078
Publikováno v:
Physica B: Condensed Matter. 353:201-204
We calculate the phonon linewidth of a Raman-active zone centre phonon in a correlated metal. The correlated metal is described by the half-filled single-band Hubbard model on a hypercubic lattice in d = ∞ . The electronic self-energy and Green fun
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f60cab2a324bc4f00b947a5d1982e1f9
https://doi.org/10.1016/j.physb.2004.09.094
https://doi.org/10.1016/j.physb.2004.09.094
Publikováno v:
Europhysics Letters (EPL). 63:743-749
We report first-principles full potential linearised augmented plane wave calculations of the electronic band structure of the compound MgB2C2 and its hole-doped derivatives Mg0.5Li0.5B2C2, Mg0.5Na0.5B2C2, Mg0.9Na0.1B2C2 and Mg0.5K0.5B2C2. The parent
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::55373f57ff13b6689a5ddf5c0f36b4d4
https://doi.org/10.1209/epl/i2003-00592-1
https://doi.org/10.1209/epl/i2003-00592-1
Autor:
Tribikram Gupta, D. M. Gaitonde
Publikováno v:
Physica C: Superconductivity. 385:415-420
We calculate the low temperature longitudinal ultrasonic attenuation rate $\alpha_S$ in clean d-wave superconductors. We consider the contribution of previously ignored processes involving the excitation of a pair of quasi-holes or quasi-particles. T
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6424bf0c3fe96804f5c3e3b0a8f369ae
https://doi.org/10.1016/s0921-4534(02)02273-6
https://doi.org/10.1016/s0921-4534(02)02273-6
Publikováno v:
Bulletin of Materials Science. 26:137-141
Results of ab initio electronic structure calculations on the compound, MgB2, using the FPLAPW method employing GGA for the exchange-correlation energy are presented. Total energy minimization enables us to estimate the equilibrium volume, c/a ratio
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::510b0054155f87cdf3675d9c3ff8a955
https://doi.org/10.1007/bf02712801
https://doi.org/10.1007/bf02712801
Publikováno v:
Journal of Physics: Condensed Matter. 14:8795-8802
Experimental results on electrical resistance variation with pressure up to 25 GPa are presented for zinc; they reveal the signature of an electronic topological transition. Theoretical estimates based on the results of first-principles band structur
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1e8ad27af33c5986793cfb24d1dac8eb
https://doi.org/10.1088/0953-8984/14/38/304
https://doi.org/10.1088/0953-8984/14/38/304
Autor:
Tribikram Gupta, D. M. Gaitonde
Publikováno v:
Modern Physics Letters B. 15:269-276
We consider a BCS-like model of interacting electrons on a square lattice. Within mean field theory, our model has an instability towards the formation of a d-wave superconducting state. We calculate the longitudinal ultrasonic attenuation rate in th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e95b1c95abc8ace36ac05e7901a14493
https://doi.org/10.1142/s0217984901001689
https://doi.org/10.1142/s0217984901001689