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Magnetodielectric study on double perovskite Pr2CoMnO6

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.

Identiferoai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0702112-153458
Date02 July 2012
CreatorsChang, Jie-Hao
ContributorsHsiung Chou, Hung-Duen Yang, Jim-Long Her, Jiunn-Yuan Lin
PublisherNSYSU
Source SetsNSYSU Electronic Thesis and Dissertation Archive
LanguageCholon
Detected LanguageEnglish
Typetext
Formatapplication/pdf
Sourcehttp://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0702112-153458
Rightsuser_define, Copyright information available at source archive

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