Abstract
Magnetic and electronic transport properties of perovskite manganite La0.6Er0.1Sr0.3MnO3 have been thoroughly examined through the measurements of magnetization, electron paramagnetic resonance(EPR), and resistivity. It was found that the substitution of Er3+ for La3+ ions introduced the chemical disorder and additional strain in this sample. An extra resonance signal occurred in EPR spectra at high temperatures well above TC gives a strong evidence of electronic phase separation(EPS). The analysis of resistivity enable us to identify the polaronic transport mechanism in the paramagnetic region. At low temperature, a new ferromagnetic interaction generates in the microdomains of Er3+-disorder causing the second increase of magnetization. However, the new ferromagnetic interaction does not improve but decreases electronic transport due to the enhancement of interface resistance among neighboring domains. In view of a really wide temperature region for the EPS existence, this sample provides an ideal platform to uncover the evolution law of different magnetic structures in perovskite manganites.
Highlights
In a fully homogeneous DE system, one would expect a sharp MIT from the low temperature metallic FM phase into the high-temperature insulating PM phase at the Curie temperature TC9,10
It was found that the LESMO sample generated a PM-FM phase transition at the Curie temperature TC = 300 K
We suggest that the substitution of Er3+ ions which induce the chemical disorder and the crystal distortion are main reasons for the observed EPS in LESMO sample
Summary
In a fully homogeneous DE system, one would expect a sharp MIT from the low temperature metallic FM phase into the high-temperature insulating PM phase at the Curie temperature TC9,10. In the protoptypical manganite (La1−yPry)1−xCaxMnO3, the competition among the ferromagnetic metallic, charge ordered insulating and paramagnetic insulating phases brings multiphase coexistence over a board range of temperatures[14,15]. Except for perovskite manganite, other correlated electronic materials such as high-TC superconductor and multiferroicity show a similar EPS behavior. For the nanoscopic EPS in manganites, both high-resolution transmission electron microscopy and scanning tunneling spectroscopy can be used to reveal the coexistence of nanoscopic charge-ordered The signal of EPR is sensitive to the variation of localized environment of magnetic ions. Due to this feature, EPR has been applied to identify the existence of EPS in some manganites[25,26]. We suggest that the substitution of Er3+ ions which induce the chemical disorder and the crystal distortion are main reasons for the observed EPS in LESMO sample
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