We report an intriguing giant dielectric and magnetodielectric (MD)
response on double perovskite Pr2CoMnO6(PCMO) system. The Arrhenius
plot indicates that the origin of giant dielectric is internal barrier layer
capacitance. Meanwhile, at the highest applied magnetic field 9T, the giant
dielectric constant around Tm ~ 150 K is enhanced almost ~ 20% (at 10 kHz
frequency) compared with that at zero field. The observed positive MD
effect is considered to be associated with the direct consequence of
negative magnetoresistance changes (~ -20% at 150 K) which was
calculated by temperature dependent impedance spectras. Concomitantly, a
pronounced ferromagnetic ordering is observed near Tc ~ 150 K coinciding
with Tm of £`¡¬(T). These experimental results suggest that the
magnetoresistive and MD effect response is very strongly by magnetic
property of PCMO.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0702112-153458 |
| Date | 02 July 2012 |
| Creators | Chang, Jie-Hao |
| Contributors | Hsiung Chou, Hung-Duen Yang, Jim-Long Her, Jiunn-Yuan Lin |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0702112-153458 |
| Rights | user_define, Copyright information available at source archive |
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