Large low-field magnetoresistance of phase-separated single-crystalline Pr0.7Pb0.3MnO3

A large low-field magnetoresistance (MR) slightly above the metal–insulator transition temperature (234 K) was observed in single-crystalline Pr0.7Pb0.3MnO3. Combining the temperature dependence of magnetization, resistance, and electron spin resonance spectra, it was suggested that phase separation...

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Veröffentlicht in:Applied physics letters 2002-05, Vol.80 (18), p.3367-3369
Hauptverfasser: Li, Run-Wei, Wang, Zhi-Hong, Wang, Wei-Ning, Sun, Ji-Rong, Li, Qing-An, Zhang, Shao-Ying, Cheng, Zhao-Hua, Shen, Bao-Gen, Gu, Ben-Xi
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Sprache:eng
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Zusammenfassung:A large low-field magnetoresistance (MR) slightly above the metal–insulator transition temperature (234 K) was observed in single-crystalline Pr0.7Pb0.3MnO3. Combining the temperature dependence of magnetization, resistance, and electron spin resonance spectra, it was suggested that phase separation occurs above the Curie temperature; ferromagnetic metallic clusters imbedding in the insulating paramagnetic matrix, and spin-polarized electron tunneling between isolated ferromagnetic clusters should be responsible for the large low-field MR observed. Undoubtedly, this observation opens a window to explore large low-field MR at high temperature, which is very important for the practical application of colossal MR effect.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.1477940