ISSN:
1434-6036
Keywords:
PACS. 71.30.+h Metal-insulator transitions and other electronic transitions – 75.30.Vn Colossal magnetoresistance – 75.25.+z Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source x-ray scattering, etc.)
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract: The doping of the manganese site by iridium (up to 15%) in the small A cation manganites Pr1-xCaxMnO3 ( 0.4 ? x ? 0.8), has been investigated as a new method to suppress charge-ordering and induce CMR effects. Ir doping leads to ferromagnetism and to insulator to metal transitions, with high transition temperatures reaching 180 K and CMR ratio in 7 T as large as 104. The efficiency with which iridium induces ferromagnetism and CMR is compared to previous results obtained with other substitutions (Ru, Rh, Ni, Cr...). The ionic radius of the foreign cations and their mixed-valencies are found to be the main parameters governing the ability to collapse the charge-ordered state.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s100510170025
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