Metal-insulator transition and electroresistance in lanthanum/calcium manganites La_<1-x>Ca_<x>MnO_<3> (x = 0-0.5) from voltage-current-temperature surfaces
| dc.creator | Knott, J C | |
| dc.creator | Pond, D C | |
| dc.creator | Lewis, R A | |
| dc.date | 2009-01-15 | |
| dc.date.accessioned | 2026-07-07T12:29:41Z | |
| dc.date.available | 2026-07-07T12:29:41Z | |
| dc.description | Of the perovskites, ABX_<3>, a subset of special interest is the family in which the A site is occupied by a lanthanide ion, the B site by a rare earth and X is oxygen, as such materials often exhibit a large change in electrical resistance in a magnetic field, a phenomenon known as "colossal" magnetoresistance (MR). Two additional phenomena in this family have also drawn attention: the metal-insulator transition (MIT) and electroresistance (ER). The MIT is revealed by measuring resistance as a function of temperature, and observing a change in the sign of the gradient. ER - the dependence of the resistance on applied current - is revealed by measuring resistance as a function of applied current. Up until now, the phenomena of MIT and ER have been treated separately. Here we report simultaneous observation of the MIT and ER in the lanthanum/calcium manganites. We accomplish this by measuring voltage-current curves over a wide temperature range (10-300 K) allowing us to build up an experimental voltage surface over current-temperature axes. These data directly lead to resistance surfaces. This approach provides additional insight into the phenomena of electrical transport in the lanthanum/calcium manganites, in particular the close connection of the maximum ER to the occurrence of the MIT in those cases of a paramagnetic insulator (PMI) to ferromagnetic metal (FMM) transition. | |
| dc.description | 15 pages, 12 figures | |
| dc.identifier | https://arxiv.org/abs/0901.2243 | |
| dc.identifier | http://arxiv.org/abs/0901.2243 | |
| dc.identifier | PMC Physics B 2008, 1:2 | |
| dc.identifier | doi:10.1186/1754-0429-1-2 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/215956 | |
| dc.subject | Materials Science | |
| dc.title | Metal-insulator transition and electroresistance in lanthanum/calcium manganites La_<1-x>Ca_<x>MnO_<3> (x = 0-0.5) from voltage-current-temperature surfaces | |
| dc.type | text |