Spontaneous and low-field magnetoimpedance in La0.7Sr0.3CoO3 and La1-xSrxMnO3 (x = 0.18-0.5)
| dc.creator | Rebello, A. | |
| dc.creator | Tan, C. L. | |
| dc.creator | Mahendiran, R. | |
| dc.date | 2009-02-10 | |
| dc.date.accessioned | 2026-07-07T12:40:29Z | |
| dc.date.available | 2026-07-07T12:40:29Z | |
| dc.description | We report ac electrical transport in La0.7Sr0.3CoO3 and La1-xSrxMnO3 (x = 0.18- 0.5) as a function of temperature and frequency in H = 0 and 60 mT. Both resistive (R) and reactive (X) components of impedance (Z = R+jX) were measured. It is shown that a smooth decrease of the resistance around the Curie temperautre in La0.7Sr0.3CoO3 transforms into an abrupt increase followed closely by a peak in R with increasing frequency. Similar behavior in R was also found in metallic compositions of the La-Sr-MnO3 series. The observed anomaly at TC is suppressed by a small dc magnetic field of H = 60 mT which rrsults in a huge ac magnetoreistance (= 30 % in manganite and =7 % in cobaltite at f = 2 MHz). The anomaly in R in zero field is also accompanied by a sudden incrases of X. While the ac magnetoresitance is negative as a function of field from 100 Hz to 30 MHz, we show that the sign of X changes and a new double peak structure develops in X for frequencies above 15 MHz. | |
| dc.description | 20 pages, 7 figures | |
| dc.identifier | https://arxiv.org/abs/0902.1780 | |
| dc.identifier | http://arxiv.org/abs/0902.1780 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/219462 | |
| dc.subject | Materials Science | |
| dc.title | Spontaneous and low-field magnetoimpedance in La0.7Sr0.3CoO3 and La1-xSrxMnO3 (x = 0.18-0.5) | |
| dc.type | text |