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Issue 25, 2017
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High temperature spin-glass-like transition in La0.67Sr0.33MnO3 nanofibers near the Curie point

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Abstract

The glassy transition of superparamagnetic (SPM) (r < r0) nanoparticle systems usually occurs at a very low temperature that greatly limits its application to high temperatures. In this work, we report a spin-glass-like (SGL) behavior near the Curie point (TC), i.e., T0 = 330 K, in La0.67Sr0.33MnO3 (LSMO) nanofibers (NFs) composed of nanoparticles beyond the SPM size (rr0), resulting in a significant increase of the glass transition temperature. This SGL transition near the TC of bulk LSMO can be explained to be the scenario of locally ordered clusters embedded in a disordered host, in which the assembly of nanoparticles has a magnetic core–shell model driven by surface spin glass. The presence of a surface spin glass of nanoparticles was proved by the Almeida–Thouless line δTfH2/3, exchange bias, and reduced saturation magnetization of the NF system. Composite dynamics were found – that is, both the SPM and the super-spin-glass (SSG) behavior are found in such an NF system. The bifurcation of the zero-field-cooled (ZFC) and field-cooled (FC) magnetization vs. temperature curves at the ZFC peak, and the flatness of FC magnetization involve SSG, while the frequency-dependent ac susceptibility anomaly follows the Vogel–Fulcher law that implies weak dipole interactions of the SPM model. This finding can help us to find a way to search for high temperature spin glass materials.

Graphical abstract: High temperature spin-glass-like transition in La0.67Sr0.33MnO3 nanofibers near the Curie point

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Publication details

The article was received on 27 Feb 2017, accepted on 31 May 2017 and first published on 16 Jun 2017


Article type: Paper
DOI: 10.1039/C7CP01276D
Citation: Phys. Chem. Chem. Phys., 2017,19, 16731-16736
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    High temperature spin-glass-like transition in La0.67Sr0.33MnO3 nanofibers near the Curie point

    R. Lu, S. Yang, Y. Li, K. Chen, Y. Jiang, B. Fu, Y. Zhang, C. Zhou, M. Xu and X. Zhou, Phys. Chem. Chem. Phys., 2017, 19, 16731
    DOI: 10.1039/C7CP01276D

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