Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1998-11-27
Physics
Condensed Matter
Strongly Correlated Electrons
8 pages, 2 figures (submitted to Phys. Rev. B)
Scientific paper
We study the spin polarised tunnelling mechanism through magnetisation and magnetoresistance in the granular polycrystalline colossal magnetoresistive manganite, La0.55Ho0.15Sr0.3MnO3. This system has a ferromagnetic transition temperature (Tc) of 255 K associated with a metal-insulator transition around the same temperature. We have investigated dependence of the magnetoresistance due to spin polarised tunnelling on temperature and reduced magnetisation of the sample. We discuss the significance of our results within the realm of a model recently proposed by us to explain the spin polarised tunnelling in granular La0.7Sr0.3MnO3, in the light of the recent finding by A. Biswas et al. (cond-mat/9806084) regarding the evolution of the total density of states at Fermi level as a function of temperature in colossal magnetoresistive materials.
Chaudhary Sujeet
Nigam A. K.
Pinto Raquel
Raychaudhuri Pratap
Roy S. B.
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