Size-dependent magnetism in nanocrystals of spin-chain α-CoV2O6
| Autor: | Yanhua Sun, Zhenxing Wang, Zefeng Xia, J. J. Li, Z. W. Ouyang, M.Y. Ruan, H. Shu, X. Y. Yue, Guanghui Rao |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Condensed matter physics Spins Magnetism media_common.quotation_subject Frustration 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Electronic Optical and Magnetic Materials Paramagnetism Magnetization Ferromagnetism 0103 physical sciences Antiferromagnetism Condensed Matter::Strongly Correlated Electrons Ising model 010306 general physics 0210 nano-technology media_common |
| Zdroj: | Journal of Magnetism and Magnetic Materials. 407:129-134 |
| ISSN: | 0304-8853 |
| Popis: | Magnetization and high-field ESR measurements have been performed to study the magnetism of nanocrystals of α -CoV 2 O 6 , an Ising spin-chain system without triangular lattice but presenting interesting 1/3 magnetization step. The results demonstrated the antiferromagnetic (AFM) enhancement and gradual suppression of the 1/3 magnetization step in nanoparticle samples. Within the framework of core–shell model consisting of the AFM core spins and the uncompensated/disordered shell spins, the AFM enhancement below T N =13 K is a result of enhanced shell disorder with weak ferromagnetism. This AFM enhancement, along with the suppression of saturation magnetization, results in the suppression of 1/3 magnetization step. Furthermore, the paramagnetism of the shell was confirmed by our high-field ESR measurements. The time-dependent magnetization suggests the presence of spin-glass-like freezing. This is expected for nanoparticles with surface shell disorder with ferromagnetic correlations, but is not expected for bulk material of α -CoV 2 O 6 without spin frustration. These findings demonstrate that size tuning is an effective parameter for controlling the ground state of α -CoV 2 O 6 . |
| Databáze: | OpenAIRE |
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