Zobrazeno 1 - 10
of 220
pro vyhledávání: '"S.V. Subramanyam"'
Publikováno v:
Physics Letters A. 371:486-489
A positive magnetoresistance (MR) is observed in the composites of magnetic nanoparticles and polymer at low temperatures. The MR decreases gradually as temperature increases and becomes negative passing through a crossover temperature regime. The MR
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::11e1e76fa7d9a1bbcafb52845eafa869
https://doi.org/10.1016/j.physleta.2007.06.060
https://doi.org/10.1016/j.physleta.2007.06.060
Autor:
Ajay K. Mishra, E.P. Sajitha, V. Prasad, Chandrahaas Bansal, Subhajit Sarkar, S.V. Subramanyam
Publikováno v:
Journal of Magnetism and Magnetic Materials. 313:329-336
Ferromagnetic nanoparticles in a carbon matrix were synthesized by thermal decomposition of organic precursor maleic anhydride using different molecular weight percentages of organometallic precursor ferrocene at temperature of 900 and 980 ∘ C . Th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::06732226825120326ee4af5d63cdf5e2
https://doi.org/10.1016/j.jmmm.2007.02.001
https://doi.org/10.1016/j.jmmm.2007.02.001
Publikováno v:
Physics Letters A. 361:500-503
The polymer-amorphous carbon composites show a negative magnetoconductance which varies as B-2 at low fields which changes to B-1/2 at sufficiently high fields. The magnetoconductance gives the evidence of electron-electron interaction in composites
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a5c4aaf54242103da46491fd674a05bc
https://doi.org/10.1016/j.physleta.2006.09.076
https://doi.org/10.1016/j.physleta.2006.09.076
Autor:
V. Prasad, P. N. Vishwakarma, S.V. Subramanyam, Parlapalli V. Satyam, S.K. Dev, Pitamber Mahanandia, Karuna Kar Nanda
Publikováno v:
Materials Research Bulletin. 41:2311-2317
Multiwalled carbon nanotubes have been prepared by pyrolysing tetrahydrofuran (THF) in the presence of nickelocene. Pyrolysis of the precursor mixture has been achieved at temperature as low as 600 degrees C. In this simple approach no carrier gas ha
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0fe8230955da59abb919a317e9d59a67
https://doi.org/10.1016/j.materresbull.2006.04.023
https://doi.org/10.1016/j.materresbull.2006.04.023
Autor:
Latha Kumari, S.V. Subramanyam
Publikováno v:
Materials Research Bulletin. 41:2000-2006
Iodine and sulfur incorporated amorphous carbon (a-C) films are prepared by vapor phase pyrolysis of carbon rich organic precursor, maleic anhydride. Transmission electron microscopy (TEM) analysis depicts the intercalation induced local structural o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::980804cd229c9f7dbdccd12c0e15ae8f
https://doi.org/10.1016/j.materresbull.2006.04.009
https://doi.org/10.1016/j.materresbull.2006.04.009
Publikováno v:
Materials Science and Engineering: B. 133:108-112
The electrical transport properties of composites of polymer and iron carbide nanoparticle embedded in carbon have been studied from 300K to 1.3K. The composites show percolative type behavior with a low threshold value. The XRD shows amorphous natur
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0f879fc549957525a4a8861dbed4fae7
https://doi.org/10.1016/j.mseb.2006.06.010
https://doi.org/10.1016/j.mseb.2006.06.010
Autor:
Latha Kumari, S.V. Subramanyam
Publikováno v:
Materials Science and Engineering: B. 129:48-53
In this work, we discuss the preparation of iodine and sulfur incorporated amorphous carbon (a-C) films by vapor phase pyrolysis technique. Iodine incorporated a-C films depict an unusual resistivity behavior at low temperatures, where a clear positi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c83a91d0defc39cb44e8009dc863c31c
https://doi.org/10.1016/j.mseb.2005.12.029
https://doi.org/10.1016/j.mseb.2005.12.029
Publikováno v:
Carbon. 44:334-340
The dc electrical conductivity of composites of poly(vinyl chloride) filled with amorphous carbon (a-C) flakes has been studied from room temperature to 1.2 K. The dc conductivity shows percolative behavior and as a function of a-C content, follows t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5b1d7005cda564aec1740a59bd0322a3
https://doi.org/10.1016/j.carbon.2005.07.018
https://doi.org/10.1016/j.carbon.2005.07.018
Autor:
S.V. Subramanyam, V. Prasad
Publikováno v:
Physica B: Condensed Matter. 369:168-176
In this paper, we report the low-temp. elec. cond. of amorphous carbon films prepd. from an org. precursor succinic anhydride at different pyrolysis temps. (700-980 DegC). The films prepd. at low temps. show activation behavior. The films prepd. at 9
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4f742024acd35dce5f4e28fae72bc1a4
https://doi.org/10.1016/j.physb.2005.08.009
https://doi.org/10.1016/j.physb.2005.08.009
Autor:
G. Venkataiah, S.S. Rao, S. V. Bhat, M. Vithal, D.C. Krishna, P. Venugopal Reddy, S.V. Subramanyam, V. Prasad
Publikováno v:
Physica B: Condensed Matter. 357:370-379
A systematic investigation of lanthanum-based manganite, La0.67Ca0.33MnO3, has been undertaken with a view to understand the influence of varying crystallite size, in the nanoscale, on various physical properties. The materials were prepared by the s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2773449f789b74e203edbc400bd64182
https://doi.org/10.1016/j.physb.2004.12.001
https://doi.org/10.1016/j.physb.2004.12.001