Effect of sintering temperature on magneto-transport properties of La{sub 0.67}Ba{sub 0.33}MnO{sub 3}/Ba{sub 0.7}Sr{sub 0.3}TiO{sub 3} composites

Journal Article · Thu Apr 12 04:00:00 EDT 2007 · Materials Research Bulletin

DOI:https://doi.org/10.1016/j.materresbull.2006.08.003· OSTI ID:21000616

Wang, C C ^[1]; Liu, W ^[1]; Cui, Y M ^[1]; Zhang, L W ^[1]

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1. Physics Department, Tsinghua University, Beijing 100084 (China)

La{sub 0.67}Ba{sub 0.33}MnO{sub 3}-20 wt.%-Ba{sub 0.7}Sr{sub 0.3}TiO{sub 3} composites were sintered at different temperatures in order to explore the possibility of improving the magneto-transport properties of the composites. Detail studies on the magnetic and electrical transport properties for the sintered composite samples have been performed. Results show that the sintered composites have identical ferromagnetic to paramagnetic transition temperature and filamentary feature of metallic phase. When sintering temperature higher than 1300 deg. C, the composites show Efros-Shklovskii-like variable-range hopping in the temperature range lower than Curie temperature. For samples sintered lower than 1100 deg. C, a dome-like resistance peak appears at a temperature well below the Curie temperature. Magnetoresistance behavior indicates the existence of spin polarized tunneling in the low temperature range. Considering the contributions from Efros-Shklovskii-like variable-range hopping and spin polarized tunneling, the resistance peak can be well fitted.

• OSTI ID: 21000616
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 4 Vol. 42; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CERAMICS
CURIE POINT
MAGNETIC MATERIALS
MAGNETIC PROPERTIES
MAGNETORESISTANCE
PARAMAGNETISM
SINTERING
SPIN ORIENTATION
TEMPERATURE DEPENDENCE
TUNNEL EFFECT