Large low-field magnetoresistance of phase-separated single-crystalline Pr[sub 0.7]Pb[sub 0.3]MnO[sub 3]

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
May 2002
Applied Physics Letters;5/6/2002, Vol. 80 Issue 18, p3367
Academic Journal
A large low-field magnetoresistance (MR) slightly above the metal-insulator transition temperature (234 K) was observed in single-crystalline Pr[sub 0.7]Pb[sub 0.3]MnO[sub 3]. 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.


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