Zobrazeno 1 - 10
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pro vyhledávání: '"C M Srivastava"'
Autor:
C. M. Srivastava
Publikováno v:
Journal of the Japan Society of Powder and Powder Metallurgy. 61:S49-S53
Publikováno v:
Journal of the Japan Society of Powder and Powder Metallurgy. 61:S54-S56
Publikováno v:
Physica B: Condensed Matter. 371:241-244
It is shown that charge transport in substituted manganites (La1/3S2/3)(0.67)Ba0.33-xSrxMnO3 (x = 0.0: 0.1: 0.2 and 0.33) is through polarons which are formed through electron-phonon interaction whose strength determines the mobility of the charge ca
Effect of Cr substitution on transport and magnetic ordering in Nd0.50Sr0.50Mn1-xCrxO3(0.001⩽x⩽0.20)
Publikováno v:
Journal of Magnetism and Magnetic Materials. 284:239-252
Chromium substitution in the charge ordered compound Nd 0.50 Sr 0.50 MnO 3 has been studied within the concentration range of 20% to examine its effect on magnetic and transport properties. It is found that the system comprises of three distinct magn
Publikováno v:
Journal of Physics: Condensed Matter. 16:4089-4102
We have synthesized La(0.67)Ca(0.33)MnO(3) (LCMO):xZnO (0 less than or equal to x less than or equal to 0.475) composites through a citrate gel route and have characterized them for magnetic and magnetotransport properties. In lower concentrations (x
Publikováno v:
Journal of Physics: Condensed Matter. 15:2375-2388
The transport and magnetic studies of a series of compounds having the general formula La0.7Ca0.3Mn1−xCoxO3 (0.1 ≤ x < 0.9) have shown that Co3+ can exist both in high spin and low spin states (diamagnetic state). This is found to affect greatly
Publikováno v:
Journal of Magnetism and Magnetic Materials. 238:178-184
The composites of La2/3Ca1/3MnO3:xSiO2 (0less-than-or-equals, slantxless-than-or-equals, slant0.40) have been synthesized by sol–gel technique to derive homogeneous nanocomposites. Si4+ by virtue of its strong preference for tetrahedral site does n
Publikováno v:
Journal of Physics D: Applied Physics. 32:2001-2005
Fourier transform-infrared studies have been carried out on the non-stoichiometric Ni-Zr substituted barium hexaferrite synthesized through the citrate precursor method. We observed approximately 30 bands, almost twice as many as reported for stoichi
Autor:
C M Srivastava
Publikováno v:
Journal of Physics: Condensed Matter. 11:4539-4555
The recent attempt to account for the existence of several magnetic phases in insulating perovskite manganites in terms of the interplay between the orbital and spin orders produced by the localized e(g) and t(2g) electrons is extended to the metalli
Autor:
C M Srivastava
Publikováno v:
Pramana. 50:11-23
The analysis of photoemission and femtosecond optical absorption spectroscopy in oxide superconductors supports the view that the charge carriers are polaronic in nature. These carriers are found to exist in the (Ba/Sr)-O planes and are coupled to B-