Spontaneous ferromagnetic spin ordering at the surface of La$ 2$CuO$ 4$ - Condensed Matter > Strongly Correlated ElectronsReportar como inadecuado




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Abstract: Magnetic properties of high purity stoichiometric La$ 2$CuO$ 4$ nanoparticlesare systematically investigated as a function of particle size. Ferromagneticsingle-domain spin clusters are shown to spontaneously form at the surface offine grains as well as paramagnetic defects. Hysteresis loops andthermomagnetic irreversibility are observed in a wide temperature range $5 -350$ K with the remnant moment and coercivity gradually decreasing withincreasing temperature. Possible origins of the spontaneous surfaceferromagnetic clusters and the relation of our data to the appearance ofunusual magnetic phenomena and phase separation of doped cuprates arediscussed.



Autor: R. V. Yusupov, V. V. Kabanov, D. Mihailovic, K. Conder, K. A. Mueller, H. Keller

Fuente: https://arxiv.org/







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